Just fitted some hellas. Might sound daft but one of the reasons I went for these was that I had originally bought the piaa's you mention but they looked daft on there own on the light bar where as these look ok and do a very good job as well.
evenflow - have a look at the Demon Tweeks website. They are doing some pretty good prices for Hella FF50 (spots) and Micro DE (fogs). Good delivery as well - ordered mine on Wednesday evening and Postman Pat was at the door with them on Friday.
I have the Hella Micro-DE FOG and love them. They are true FOG lights in that their beam pattern is WIDE and FLAT. I think about 120 degrees wide and about 20 verticle. Really nice!!! I can run them all the time so cars see me and in foggy conditions, they really work.
I also have the Hella FF50 mounted for driving lights and love them.
I have PIAA 1100 on my LT along with HID. Works good to, but I like the above combo best of any I've tried.
I have them on all the time and other road users certainly see me as they now move over in standing traffic which is nice. Yet nobody has flashed me to suggest they are set too high.
On the way home there is usually less traffic, I do about 8 miles on unlit country roads and thats where they really make the difference in my opinion.
Well recommended.