I have the 305 and love mine. The onboard maps do suck but if you know where you're going it's not too bad. I've been lost before and used the map to at least loop back to where I'd already been and then it was fine.
I'm actually considering getting a 705 simply because I'm saving for a PowerTap at the end of the year and it'd be really nice to have all the metrics on one computer. And I'm not a fan of the PowerTap computer anyway...
If you're not interested in power or maps then you can't go wrong with the 305. If you want all the bells and whistles, get the 705. I'd personally stay clear of the 605, it's like the 705 but without all the useful stuff.
EDITED to add:
You definitely need the HR and cadence/speed sensor package if you're at all serious about training. The cad/speed sensor also means you can log your trainer miles if you're doing stuff indoors.
Edited by: WONGERCHI at: 4/9/2009 (10:52)
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