Right on Tortie! In my experience, you need to spend huge money on SD cards to get a decent write time. Write time to SD cards is TERRIBLE.
I too am impressed with Nikons AF. So far, the D700 is one I can trust in AI servo even in static situations! It's a world different than your XTi. In my opinion, those older rebels are pretty tough to trust AF accuracy but they're good cameras.
Thanks! That first sentence made me feel so much better about trying out a new camera.
That is one thing that I would've liked the D3000 to use, CF cards. I feel they're a little more durable (physically and write-ability wise). I'm a fan of Lexar and since I've got one of their 233x CF cards, I decided to go for their 133x SD card. I suppose the write time could be worse, it just is noticeably slower than my XTi.
I can never use AI Servo on my XTi. Every shot comes out either completely blurry or focused on the wrong point. I thought it was me (still very well could be) but either way, it's unusable to me. I also like Nikon's AF-C (auto, I believe?) option. Amazes me how accurate it is.
EDIT: And.. I might have just found out why it was so slow to write to the SD card. I was experimenting with the D-Lighting feature and forgot to turn it off before I went outside. Probably the reason it took so long, ha.