Yes I could. But I don't like using Windows User accounts/passwords etc.
1) Anyway did some testing last night. Tried the Google contacts sync through iTunes - was OK it brought hundreds of extra contacts and random email address's from my Gmail account. So was a bit messy, and does not support Groups!!
2)Then I tried
Google Calendar & Contacts Sync through Microsoft exchange to my Gmail account. Again a bit messy and no Groups, but does over-the-air sync.
3) Then I tried
SyncInABlink app, which does a over-the-air sync. Just a brilliant little app, does have a cost, but worth it. It can Merge your current iPhone contacts with your Gmail contacts, and if you make new Groups in your Gmail, they appear on your iPhone too

(Default groups don't seem to show up, so make your own custom ones and use those)
So result!

I have 2 iPhones, 2 separate sets of contacts, that I can sync anywhere any time and no conflicts
