No, there is not. There is the 5830, 50, and 70.
Really?
If you do heavy video encoding or rendering, you will benefit from a 6 core, or an i7 w/HT, and 8 - 16GB RAM, as you will use it.
I put close to £1500 into my current PC, it's not a waste if you use the hardware that you buy.
Also, you...