3-4 Month Upgrade Plan (Need Help)

Hello I am trying to upgrade my computer to DDR3 and SLI. I plan to do this in multiple steps as posted below, also posted are the specs.

My first item is my PSU which I intend to upgrade to ensure I can use SLI. That will be purchased this weekend so I can install it for my Birthday.

Next will be a SLI capable MOBO, because I obvoiusly can't SLI without one, obviously at this time I will upgrade to DDR3 8gbs

Finally would be another GTX 460 to sli.

Does this seem like a good plan? Are there any changes to order? I considered getting the EVGA GTX 460 before the mobo so I can make sure I get the exact one I already have before Newegg pulls it from its selection.

Also any suggestions on PSU, MOBO, and RAM would be greately appreciated.

Case - ABS Aplus El Diablo
Motherboard - BioStar TForce TF8200
PSU(Power Supply Unit) - OCZ StealthXStream 700w
CPU(Central Processing Unit) - AMD Phenom II X4 Deneb Black Edition @ 3.0 Ghz
CPU Fan - Arctic Cooling Freezer 64 Pro /w Arctic Silver 5 Thermal Compound
DVD/CDROM Drive - Kind of a long name :)
RAM - Kingston HyperX 4GB (4 x 1gb)
GPU (Graphics Processing Unit) - EVGA GTX 460
Windows 7 64bit HP

http://ghost4k.blogspot.com/2011/07/updated-pc-specs.html

you recylcing the case. cause thats a pretty awesome looking case. if nothing more