The memory on the 700wx is almost doubled, it is a HUGE difference. If you have a Sprint WX you do noe have A2DP, however, it has already been hacked so that you can install it.
Read the FAQ sticky on top of the forum for links to generally used applications and hacks, etc.
You can find links to all the PDF brochures with specs on this site...
http://www.palm.com/us/products/smartphones/treo700w/