Building a HTPC for under $400?

I am attempting to put together a HTPC for pretty cheap and I think I can get a good enough one for a little under $400.

I have a projector (1080p) and receiver that take HDMI and optical audio. I only want to use it for watching videos, viewing pictures, and browsing the web. I already have software and mouse/keyboard

(I have not shopped around, but I roughly found what I think I need at Newegg and expect that to be close to the lowest I'm going to find)

Motherboard
http://www.newegg.com/Product/Prod [...] 6813128072
GIGABYTE GA-73PVM-2SH LGA 775 NVIDIA GeForce 7100 HDMI Micro ATX Intel Motherboard $68.99

== (1) This had HDMI output and optical audio output -- do I also need a separate video card or sound card?

CPU
http://www.newegg.com/Product/Prod [...] 6819116069 (free shipping)
Intel Celeron E1400 Allendale 2.0GHz 512KB L2 Cache LGA 775 65W Dual-Core Processor $44.99

== (2) Does this CPU fit the motherboard I listed? The slot is correct, but I was confused by the "CPU Type."

RAM
http://www.newegg.com/Product/Prod [...] 6820148239
Rendition by Crucial 1GB 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Desktop Memory $10.99 x2

Case + PSU
http://www.newegg.com/Product/Prod [...] 6811154087
APEX DM-387 Black Steel MicroATX Slim Case Computer Case 275W Power Supply $44.99

== (3) Nice small case that doesn't "look like a computer," I trust the PSU is sufficient?

Hard Drive
http://www.newegg.com/Product/Prod [...] 6822145233 (free shipping)
HITACHI 0A38016 1TB 7200 RPM 16MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive $74.99

Blu-Ray Drive
http://www.newegg.com/Product/Prod [...] 6827106285 (free shipping)
LITE-ON Black 4X BD-ROM 12X DVD-ROM 32X CD-ROM SATA Internal 4X Blu-Ray DVD Drive Model DH-4O1S-58 $76.99

HDMI Cable
http://www.newegg.com/Product/Prod [...] 6812270003 - $5.99

Optical Cable
http://www.newegg.com/Product/Prod [...] 6812816076 - $9.29

Total Cost: $348.21 ($367.34 including the $19.13 shipping from Newegg)

I am willing to go as high as $600 if there are any real weak spots in my proposed build, so please make suggestions regarding worthwhile things to upgrade or downgrades to save some money. Any assistance is greatly appreciated.

+1 to Cpt Deadboots build. Trust me, you don't want a computer with 1GB of RAM, even if it is just a HTPC. Those components are considerably better all-around.

The OP said he could go up to $600 if there was a good reason to. I have my doubts that the original build could even smoothly play a BluRay movie.

MY BAD SHORT STUFF WHEN THE OP IS TOO LONG I KINDA SPEED READ

Am I going to overheat doing what I want to do (watching videos / browsing)?

Why that board? What makes it better than Cpt's $10 cheaper one? Is 2.1 ghz enough for Blu-ray? Points to you for saving me $3 on RAM!!

Much appreciated everyone.

nah man 275 is plenty, and if running xp u could either drop 1gb or use the 2gb in dc and benefit from the xtra speed.

i put the hsf cause the cpu i chose dosent come with a cooler
also that cooler has a lower sound output than the average

This is all probably pretty confusing - but the reason I suggested the Earthwatts PSU is because of its reputation. Its internals are manufactured by the best in the business, whereas the Apex's PSU is likely to blow up within a year.

The Apex case looks fine, just make sure you get a higher quality PSU to go with it. Antec, Silverstone, and SeaSonic make some great ~$35-$50 PSUs (don't settle for cheaper than one of these).

The reason I'd still recommend the build I posted over the ones listed above (as I stated, you can change the case to a cheaper one) is because of the power efficiency and excellent overall performance. You don't need a 790 chipset if you won't be overclocking, and that processor is dirt cheap. I chose it over the 2.1 GHz model because it isn't OEM (it comes with a boxed cooler; you'll need to buy a cooler for the 4050e).

As far as the onboard GPU borrowing from your memory: it won't affect overall performance, especially if you're running XP or Ubuntu. Set it to use ~256mb and you'll be fine.

Make sure you take into account shipping costs - that memory kit saves you a couple of bucks right off the bat, but the kit I suggested has free shipping. The Kingston kit will end up costing you more.