Hardware upgrade for Inspiron 1520

Hello everyone,

Trying to upgrade my 1520. Ultimately I want to upgrade my hardware and move from XP to Win 7.

My service tag is

CPU: Intel Core 2 Duo T7250 @ 2GHz

RAM: 2GB DDR2        Looked this up and can upgrade to 4 GB,  2x 2GB each Manufacuter# SNPTX760C/2G. (Seen this on Dell site)

HD: Toshiba MK1637GSX SATA 160 GB      Comparative to Dell 128GB SSD SATA

GPU: NVIDIA Ge Force 8600M GT     As far as I have read this is best I can get.

Any input for memory of SSD would be appriciated. Please let me know any specifics I need to know for the SSD, I guess that as long as it is SATA it should work.

My problem is the CPU, I can't find any information on the motherboard to determine what I can upgrade too. The Core 2 Duo T700's go all the way to T7600, if you can find it. I found the T7400 for a reasonable price but don't know if the board will hande it.

Then my next problem may be the software, I have read here that drivers for Win 7 don't exist for Inspirons and you need to use the ones from Vista. Correct?  

Any and all help will be greatly appreciated. I have built my desktop but never upgraded a laptop and need some help.