Could I get some advice on my build for a gaming computer

I'm planning on spending around $1000 on this computer and was wondering if someone could tell me if I need some adjustments.

This is what I've got so far.

Motherboard - Intel P45

Video Card - HD4870

PSU - Corsair 650w (is this a waste of money? I've heard that I didn't need 650 watts)

Memory - 4gb PC8500

CPU - E8500

Case? ( how do I know if the case is compatible) and any recommendations?

CD/DVD - any recommendations?

Thanks.

It's never a waste of money to buy a higher watt PSU. I thought I could get by with the stupid one that came with my case and boy was I wrong.

For CD/DVD, at the very least a dvd rw.

Other than that, decent setup.

CD/DVDRW drive... Samsung, LG, Sony. OEM as always.

Case... mid and full tower ATX should do you good. Antec 900, 1200, P18X maybe? I'd recommend a Lian Li case also but they're pretty expensive for a $1000 budget.