Although 7210 and 6610 are both colour, J2ME, polyphonic etc. I think I'd prefer the 7650 for the Symbian O/S and it can take not only J2ME apps but also Symbian ones too. In terms of weight it's only another 10g on top of my 7110.
I know that the 7210 & 6610 have FM radio that the 7650 would lack. But look at some of the J2ME games for the 7650, the following is one of many great looking titles...
I was actually going to wait for the 6610 but the more I see and investigate the 7650 the more it grows on me <img src="http://www.mbclub.co.uk/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt='

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The 7210 and 6610 are actually identical in terms of internal electronics... both feature the new pop-port, funny that neither are bluetooth. Just that the 7210 is dressed in snazzy covers whereas the 6610 is more traditional looking (and better for that imho).
I know the 7650 has its own short-comings... e.g. it has bluetooth but doesn't support bluetooth audio format. It only has 4Mb of memory with no way of upgrading. It's only WAP 1.2.1 but that's easily fixed by downloading an HTML browser app, hehe I'm still _very_ tempted.
Thanks for your input guys, appreciate it.
S.
p.s. Am I the only one to think that the colour screen on the Sony Ericsson T68i is very mediorce/lacklustre?