the Samsung D600 is very good
I used to have a Sony Ericsson k750 - didn't like it, got scratched very quickly, annoying keys
Currently have a Motorola U6 "PEBL" - very nice, tactile, feels rugged, nice flip action (one handed slide and flip)
The Motorola V3 "RAZR" to me looks odd and not particularly ergonomic, if I had one I'd be fighting the temptation not snap it or stamp on it

- there's a better 3G version, the V3X available on Vodafone and 3
I can't stand Nokias - kid's toys
Used to be on Orange everyday 50, until Orange f'd up and started to charge for 0800 numbers, and wouldn't offer me anything reasonable to stay with them, so currently have the "free" PEBL on 02 through onestopphoneshop (a carphone warehouse website) that averages out at £14.20 per month (7 Months Line Rental At £1.99 offer) for 200 x-network mins and 100 texts per month (400 and 200 for the first 3 months) and will probably switch network again once the 12month contract is up next Jan - there seem to be very good offers every January!