Hmm, I can't speak for others, but I have done my own tests because I own both CPU's. I run my 3200+ Venice at 2.8GHz though... but 2.7GHz is more apt to be the 'norm'.
At stock speeds, a 1M Super Pi run wound up showing near identical scores for both my 3200+ and 820 D, so I wouldn't worry too much about losing performance by choosing the 'wrong' CPU. I'd be quicker to recommend the 820D only because it's a dual core, and that will speed up multi-media production, as long as you are using multi-threaded applications.
In the end, I'd go with the 820 D simply because it's Dual Core. If you don't care about Dual Core, get the 3200+ as it will likely allow smoother gaming performance. Oh, I should mention that if you do want the 820 D... you should get at least a better air cooler for it. The stock cooler is -rediculously- loud... the whiniest stock cooler I've ever come across.
Intel Core i7-3960X, GIGABYTE G1.Assassin 2, Kingston 16GB DDR3-2133, NVIDIA GeForce GTX 770 2GB
Kingston HyperX 3K 240GB SSD (OS, Apps), WD VR 1TB (Games), Corsair 1000HX, Corsair H70 Cooler
Corsair 800D, Dell 2408WFP 24", ASUS Xonar Essence STX, Gentoo (KDE 4.11. 3.12 Kernel)
"Take care to get what you like, or you will be forced to like what you get!" - H.P. Baxxter
<Toad772> I don't always drink alcohol, but when I do, I take it too far.