And regarding memory ... the 8900 has double the memory (256mb) compared to the Bold's 128mb.
Also, if taking pictures is an issue, then the 8900 would be your best bet since it has a 3.2mp camera vs. the Bold's 2mp.
Consider the Tour since it is a big mashup of the Bold and the 8900, if going to Verizon/Sprint is an option.
I am going to use it for email,skype(iskoot),internet,good reception,decent memory
If these are the criteria for your decision I'd go Bold. In my opinion Bold has superior keyboard for typing, decent native browser and if you don't load it down with tons of apps, decent memory...Bold can handle a big ol' media card too.
+1 for reading the comparison thread.