Sicarius43

Hi, I'm building a new computer fairly soon and I'm not sure what PSU I need.

The Basics:
Processor: Intel E8400
Motherboard: Asus P5Q
Video Card: Radeon HD 4870
Ram: Patriot Viper 2GB DDR2 1200
Hard Drive: Seagate 7200.10 250GB 7200RPM
Sound Card: None (Integrated)

My build will be with a single 4870, however I plan on buying a second card to put into crossfire in roughly 1-2 years (to further "future-proof" as time goes on)

Questions:

1) Should I buy a PSU capable of running two 4870s now so all i have to do in the future is buy another 4870 card? If so, what PSU do I need?

or

2) Should I buy a lower PSU capable of running one 4870 now and buy a new PSU and 4870 card in the future? If so, what PSU do I need?

The idea would be to save money by buying a higher power PSU in 1-2 years as prices go down(since I wouldn't utilize Crossfire until then anyway).

Also, feel free to comment or make suggestions on my overall build as it's my first one.

Thanks in advance for your responses

Tumbleweed36

You asked for opinions and here is mine:

1) I don't think you will need two of these cards and the cost to efficiency ratio would not be a very good financial decision. I think one will do all you want. By the time you save enough for the second card, there might be another new and better card out there that would be a step up for you.

2) Next, I think it would be wiser to take care of the issue and future proof your rig at this time instead of waiting.

3) Third, IMHO, I would be looking at an 850 power supply in case you do decide to move up later. Here is a list that you need to consider when you purchase a power supply:

Seasonic - any model
Corsair - any model
Thermaltake - "Toughpower" series only
PC Power & Cooling - any model