Yea, you should have done a better search before asking any questions. Anyway, my suggestion to you is to go for W810i for the following reasons:
1. W810i screen is 0.1" bigger than W800i. 2. W810i screen is brighter and sharper than W800i although the resolution remains the same... 176 x 220. 3. W810i support EDGE which is faster than GPRS on the W800i. 4. Last but not the least, W810i is newer model than W800i. 5. Go with the W810i (White), it comes with 1GB msd.