Diamond Vs. Pro HELP!

[Tsuekasa]

I did alot of research on both. I already know pro has expandable memory with 512 internal memory with keyboard. Diamond has the 4gig internal memory with no keyboard or expandable memory.

My father said that the pro floor model at bestbuy keyboard was loose and when you hold it the keyboard slides out. Of course this could be from people sliding it to much. But it concerns me.

Here are my questions

1. Do the diamond handle the same 3rd party software and etc as the pro?
2. Which one is faster (processing, multitasking, internet and etc)
3. Which should I choose