Best Upgrade for HTPC

Hi all, I've used the forum a lot to figure out what to do next, but I am at a crossroad now, and would love some advice.

I currently have a home built HTPC, which is starting to show it's age (and constantly run to loudly). I was hoping you all could recommend a good upgrade, trying to salvage whichever of these parts I have to save money. I know that many of it is yesteryear's components, but all I use this PC for is watching movies/streaming video.

My main problem with my current build is noise. The fans run high all the time, while my components still seem to be hot (IE: GPU @ 51 degrees, CPU at 45).

Case: APEVIA Black / Silver SECC Steel / Aluminum X-MASTER-AL/500 ATX Media Center / HTPC Case (http://www.newegg.com/Product/Product.aspx?Item=N82E168...)

Mobo: ASRock A770DE+ AM3/AM2+/AM2 AMD 770 ATX AMD Motherboard ( http://www.newegg.com/Product/Product.aspx?Item=N82E168... )

CPU: AMD Phenom II x4 940

Graphics: MSI R4550-MD1GH Radeon HD 4550 1GB 64-bit GDDR3 PCI Express 2.0 x16 HDCP Ready CrossFireX Support Low
Profile Ready Video Card (http://www.newegg.com/Product/Product.aspx?Item=N82E168...)

Memory: Wintec AMPX 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) (http://www.newegg.com/Product/Product.aspx?Item=N82E168...)


Any advice would be helpful. What would your next upgrade of this be?