Went to Carphone Warehouse, to try out some phones. My local (Kirkcaldy) was out of the 6610i as they had sold them all. It at least shows they are popular. Another that was out of stock, was the Siemens CX65 was recalled because of a bad batch. The good news is that Siemens did it on their own initiative to stop customers receiving below standard phones. They both look to be contenders so I'll try one of the Edinburgh branches.
The two that I did try were the Siemens SL55 and the SE T360 both in black. The SL55 was very nice, looks alot more masculine than the old red and silver style, nice keypad. The screen was no worse than my T68i and the OS seemed a little older, but intuitive. A genuinely nice little phone and the cheapest of the sliding type phones I've seen. Having tried a T610 I thought the T630 would be more of the same I wasn't quite prepared for how much nicer it is. Firstly the screen is insanely good, I would have no worries using it in direct sunshine and the sharpness is significantly better. Also the Black simfree T630 is different from the T-mobile one, the keypad is black like the sides and the speaker part at the top is a dark metal effect. It is a phenomenally classy looking phone. So the T630 is winning, but I want to give the Nokia and the Siemens a fair crack.