Replace Radeon 2400XT for HTPC maybe gaming

I have a Quad Core Dell Optiplex 755 DT with a Radeon 2400XT Graphics Card that came with it. I have basically started messing with this system to turn in into a HTPC ready for moving to my new flat.

Software wise I am using W7 Mediacenter with Mediabrowser which I am very happy with.
For movies it will be ripped Blu-Ray movies and HD iPlayer etc(x264 MKV rips in highest quality, these need to run flawlessly at 1080p, 24fps etc)
I will be fitting a DVB tuner in the system which will be mostly SD as will Sky Player. Up-scaling of this would be good.

I need a graphics card that has HDMI that carries the best sound possible. (Optical out would be a bonus)
Noise is not really an issue as I hope to put the system in my loft.
I would love to be able to play games as well upto say the standard of the xbox360 so maybe a card with good power saving that can ramp up when needed but run on little power when not.

As an aside, will a wireless RF media center remote wake up the system? If it will are there any recommendations?
If thats not an option are there any tiny IR sensors that I can hide on the TV wall mount somewhere?
Also if anyone from UK knows any good W7 compatible Dual Freeview tuners call them out.

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More about replace radeon 2400xt htpc gaming
  1. Since you also want to play games, a 5750 would probably be a good choice for you. You will need to replace the stock PSU, if what you have is <400W. Choose one with full range active PFC (no little voltage switch) and at least 80+ certification. Antec, Corsair, PC Power & Cooling, Seasonic, and Enermax are among the better brands.
  2. Disclaimer: I know nothing about HTPCs

    You may not need a card that expensive unless you want to play cutting edge games on high settings. The best cards you could get without switching the power supply* would probably be an ATI 4670, or a Nvidia GT 240. ($65-80) These would play almost all games, but maybe not the newest at the highest resolution settings. If you have more to spend jtt283's suggestion is a good one.

    *maybe. this depends on what your PSU actually is. 250-300w could probably handle these lower suggestions.
  3. 5770 and change psu
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