Not sure TA's are any more grippy than Tourances to be honest. I've got TA's on my GSA at the moment and they are good neutral tyres although they seem to have worn oddly.
If you are a pure road rider, have a look at PR3/4's which get good reports on GS's. I've got a set on a Caponord and they really do grip well but don't go near a muddy track with them