Will reiterate last poster's advice about getting a good power supply. Keep in mind that if you get a bad one, it can potentially fry everything else in your case. It's a worst-case scenario, but getting a better PSU is like insurance.
Definitely don't pay more than 20 bucks for a DVD anything. I got my Samsung burner for $16.
Honestly, if you're not gonna use it for anything more than multimedia, go AMD. The motherboards and CPUs are less expensive. Just from a quick jaunt to NewEgg, I could find you a case, mobo, CPU (unlocked, extra bang for your buck if you'd like), aftermarket heatsink (I don't trust stock heatsinks >.>), a power supply, RAM, DVD burner, and a decent HDD, and I still came in $60 under your budget.
CPU: AMD Phenom II X4 965 Black Edition, quad-core, 3.4 GHz
Motherboard: Biostar A960A3+, AM3+ socket
Heatsink: Cooler Master Hyper 212+
RAM: 4GB G.skill Ripjaws @1600MHz
HDD: WD Blue 500GB 7200RPM
Case: Cooler Master Elite 311 mid tower
PSU: Corsair Builder series 430W
Lite-on DVD burner
Under budget and some will probably say that is massive overkill for what your intended use is, but it's got upgradability going for it for sure. You can overclock the ever-loving crap out of the Phenom Black Eds., and if you feel like upgrading later, the AM3+ socket is here to stay, or so AMD says. I've always found mATX mobos and micro cases to be a bit claustrophobic, but that's sorta a matter of taste. More room will give you less hassle with cables and better cooling, though. There will be a million suggestions and everyone here knows what they're doing, so take this with a whole shaker of salt.
Subtotal: $387.92, everything has free shipping.
In short, it's never been a better time to homebuild, TBH.