baffling OS decisions

If I buy Tv tuner card from EVGA or wherever would my pc benefit from windows xp media edition. All I can get is OEM and My copy of xp pro is a OEM dell with service pack 1 and it is ancient so.............time to purchase a OS. I mostly do photoshop, games and music. Micrisoft Office is used often also.
I have
always on cable connection
d link modem
tv cable with set top boxed
hooked up to my sound card I have dolby surround sound receiver and bose "accoustimass 7" speakers and seperate rear
gigabyte K8NS 939 ULTRA
AMD 64 3500
GeForce 6800 ultra 256
Creative audigy 2
2 gb ballistx (crucial)
2 raptors 74 gb ea
antec 550 power supply
Pioneer dvd cd rw
creative jukebox c mp3 player
not on PC
a Sony DVD player and recorder in my house
another Harman Kardon 430 receiver that runs speakers in 3 rooms of my house
x box connected to den TV
4 TV's
can all this some how be incorporated?
I ordered the OS Cd with remote but am having second thoughts mostly because of input from friends who say it is a bad idea (no real reason why except hardware compatability)

 

You should be able to use all that on XP...

Personally, I couldn't justify the cost of another operating sytem!

http://www.microsoft.com/products/i...ovr&pcid=5c52c316-6652-42d1-ac4f-dee061d5497c

I don't see anything here that you couldn't do on your current OS w/ a little research.