I would suggest K500/K300 over T630
T630 is a old model, and though it has Bluetooth while K500/K300 don't have, there are many other things that matters.
K500/K300 have 12 MB memory, enough for many games and wallpapers/ringtones. It is not expandable but far better than T610/T630's 2MB, N6610i's 4MB and one of most popular nokia model, 6610's 640KB.
K500 and K300 both supports real Java 3D games with great sound which is not possile in T610/T630.
K500 and K300 have VGA camera (640x480) with video recording and 4x digital zoom.
K500 and K300 natively supports MP3 too. But considering memory of 12MB, it is better to restrict it to MP3 ringtones only.
So K500/K300 are best packages at given cost.
If u wanna increase ur budget little higher, Motorola E398 is ideal with expandable memory and good still camera (no video) and best sound in market and this phone comes with 64MB card too.