Get the 8900. It's an improved Curve. The 8900 is like a mini Bold. You get a thinner phone, a much better screen (480x360 on 8900, OVGA on 8320), the new 4.6 OS, a usable camera, 4x the amount of RAM and GPS. Also, the 8900 has a 524 MHz which is around 1.5x faster than the 8320's processor. The extra $100 will make you like your phone, not be cursing at it for low memory issues and lag.