Thanks for the quick reply- what if I add the k790a into the mix? Is that camera significantly better? How would you compare the size difference between it and the w810... is the k790 as bulgy and large as it appears?
W810i sounds the best - but it's getting outdated fast [IMHO].
If you need A2DP and autofocus, go with the K550i. If you prefer the W610i's styling over the K550i, get the W610i instead. If you prefer the K550i's styling over the W610 but want Walkman 2.0 and flash themes, you can easily get a K550i and flash it to a W610i.
The W580 has a 'shake' feature, along with a bigger screen and a 2MP(without autofocus), but the cracking keypad may become a more serious issue. The K550i is known to creak like crazy (mine doesn't thankfully).
If you really want a bigger screen along with more stuff like fitness applications, go for the W580. I don't know how reliable the cracking keys are though - just my $0.02
1000 posts 08/15/07 @ 12:02am / 2K posts 05/22/08 @ 10:47pm Sony Ericsson K850i speedtest