Gaming PC Build Help?

After reading on 5770 or 5850, i have a couple of questions

For 1680 x 1050 @ mid - max settings : Should i just get one 5770 and get another later or a 5850 right now?
For 1920 x 1080 @ mid - max settings : Again, 2 x 5770 or 5850 or 2 x 5850?
For Eyefinity at 1680 x 1050 * i dont know much about eyefinity * : 2 x 5770 or 1 x 5850 or do i need 2 x 5850?

My budget for graphics right now is at a max of 300$. Updates will be done later, like 6 months or 1 year.

Next, Processor ( ZZZzzzzZZzzzzZZzzzz )

Taking the following factors into consideration, should i go for AMD Phenom X2 955 or AMD Athlon X3 435? The thing here is i am thinking of buying a processor from AMD's 2011 line up ( the bulldozer and stuff ) but i dont know which socket they are going to use... so i have narrowed down to these two processors. They are 160$ and 75$ respectively and their respective motherboards also differ in price as far as i've seen. So, as i would be gaming mostly at 1680x 1050, as i've been doing for many years  , Which one should i go for and be sure that the graphix wont be bottle necked?

5770: Which Processor ?
2 x 5770 ( xfire ): Which Processor?
5850 : Which Processor?
2x 5850 : Which Processor?

Next, Motherboard ( FAINTS! )

How much should i expect to spend here if i went for either 965 or 435, leaving space for crossfire?

Next PSU, Casing, RAM, Hard-Drive, Optical ( jumps off the roof? )

As ATI recommends 600 Watts for Crossfire and 450 Watts for Single Card, can i just follow those guidelines and go for a 650W PSU?

For RAM, How much should i expect to spend? is a max of 50$ for 2 GB Ram enough and will it be enough not to bottleneck perfomance?

Hard-Drive : Any guidelines on choosing one?

Optical : blah nvm this, 20$ for optical...




Ok this is very jumbled question but it is all because of all the reading i've been doing.. i have come here to solve all these doubts once and for all! please help  (