Route looks pretty decent, the main thing is what you can take in during your 2-3 night stops, we did quite alot with less time in 2011
http://www.ukgser.com/forums/showthread.php?t=279972
There is less at the south end of your trip, Col di Turini is OK and it is very scenic at the top, but there are more passes a bit further up around Guiilestre and Albertville.
Grab a copy of the Alpine Passes Garmin file from this site, it makes it easy to plan routes like this by joining the passes.
The "Motorcycle Journey's" book has a lot of routes around RDGA you can easily do 4 full days of riding around Guillestre, and maybe find another 3 days riding around Albertville.
La Bonnette
Try to ride La Bonnette if you can, you skirt around it over the Col de Allos (I think) I would re-route East a bit and ride La Bonnette instead. After St-Martin-Vesubie turn up north towards Isola 2000, then St Etienne de Tinee - you are now at the foot of La Bonnette following this re-joins your route at Jausiers, you really canno tmiss the highest pass in the Alps - the other option is to come back and ride it on one of your spare days, but it may be easier to ride this on your way up and loop back around Allos on a spare day.
Last Day in Alps
From Albertville your route is pretty dull, if you can spare the time head East to Bourg St Maurice over Col du Pre, Cormet De Roseland, then you can take the PSB, Col San Carlo and GSB back to Martigny to rejoin your route - 4 great passes instead of two lesser ones (Montets and Forclaz). This is about 5 hours in the saddle, so if the weather is good a very pleasant full days riding with plenty of time to take in the views. You need to zoom out on this map:-
<iframe width="850" height="700" frameborder="0" scrolling="no" marginheight="0" marginwidth="0" src="https://maps.google.co.uk/maps?f=d&source=s_d&saddr=albertville&daddr=45.6946194,6.6566976+to:Bourg-Saint-Maurice,+France+to:SS26+to:45.7454783,7.0031966+to:Unknown+road+to:45.8650721,7.1539583+to:Route+de+Champex+to:46.5345098,7.3510525+to:thun&geocode=FQ_0uAIdlothAClvfPUTCcOLRzFXgQ5hUBWNEg%3BFZs-uQIduZJlAClpuq2Wi2CJRzFPXJS7ZgHcjA%3BFaYVuAIdjEtnACk5diWCNGaJRzGwtrrkKqsIBA%3BFV6NuQIdOuZpAA%3BFUYFugIdPNxqACn_Da1AFT-JRzFr8iKCIf0OXA%3BFYJIugId-ppvAA%3BFXDYuwIdJiltACmJQdswTjCJRzFj_7rNEM40gA%3BFff_vgIddfFrAA%3BFW0PxgIdDCtwAClFHQS7Z_eORzF-Uq13TCFy5Q%3BFQxTyQIdO150ACkDt6xIjrKPRzGcVyNlY3vqgA&aq=&sll=46.464349,7.462463&sspn=1.154038,3.356323&hl=en&doflg=ptm&mra=dpe&mrsp=8&sz=9&via=1,4,6,8&ie=UTF8&t=m&ll=46.464349,7.462463&spn=1.154038,3.356323&output=embed"></iframe><br /><small><a href="https://maps.google.co.uk/maps?f=d&source=embed&saddr=albertville&daddr=45.6946194,6.6566976+to:Bourg-Saint-Maurice,+France+to:SS26+to:45.7454783,7.0031966+to:Unknown+road+to:45.8650721,7.1539583+to:Route+de+Champex+to:46.5345098,7.3510525+to:thun&geocode=FQ_0uAIdlothAClvfPUTCcOLRzFXgQ5hUBWNEg%3BFZs-uQIduZJlAClpuq2Wi2CJRzFPXJS7ZgHcjA%3BFaYVuAIdjEtnACk5diWCNGaJRzGwtrrkKqsIBA%3BFV6NuQIdOuZpAA%3BFUYFugIdPNxqACn_Da1AFT-JRzFr8iKCIf0OXA%3BFYJIugId-ppvAA%3BFXDYuwIdJiltACmJQdswTjCJRzFj_7rNEM40gA%3BFff_vgIddfFrAA%3BFW0PxgIdDCtwAClFHQS7Z_eORzF-Uq13TCFy5Q%3BFQxTyQIdO150ACkDt6xIjrKPRzGcVyNlY3vqgA&aq=&sll=46.464349,7.462463&sspn=1.154038,3.356323&hl=en&doflg=ptm&mra=dpe&mrsp=8&sz=9&via=1,4,6,8&ie=UTF8&t=m&ll=46.464349,7.462463&spn=1.154038,3.356323" style="color:#0000FF;text-align:left">View Larger Map</a></small>
Try to work as many of these into your hit list as possible, some will be on your route others may run parallel so you will need to do a run out on one of your spare days to work them in, I have starred some of my favourites, but the're all good and you will ride a few other "lesser" passes whilst running around them as well.
**Col d'Izoard, **Col du Galibier, Col Agnel, *Col di Sampeyre, Col de Lombarde, Col de Larche (Maddelena), *Col de la Cayolle, ***La Bonnete, Col Valberg, **Col de L'iseran, Petite St Bernard, *Grand St Bernard, *Cormet De Roseland
It is very easy to do a lot of miles on a trip like this and miss so many opportunities, the Garmin file with all the passes is great for showing what is nearby, compared to blindly using google to link towns you can easily double the passes ridden just riding A-B and with the odd spare day at strategic towns for circular rideouts can maybe quadruple what you get to see / ride on your Journey - although I know others prefer to just make it up as they go along, I try not to have a rigid plan, but know what can be done if I have the time / weather and inclination.