Well I've finally decided to do it.
I'm going to sell my Treo 680 - in fact I've listed it on e0bay this morning. If you're interested in making a bid, it can be found here. I'm rather sad about it in a way, because I actually love the device, but reports on the Centro are very positive, and if I can sell it for anything close to what I think it's worth, I'm going to bite the bullet and get the Centro. Then I might flog by HTC Voc (S710) too and be quids in. Then again I might not. Either way, I'll keep you posted.