Best Processor for video encding.

I'm looking to buy a new PC.

I my budget I have a choice between:

-An i5 Dual Core 3.3ghz

or

-an intel quad core 2.3ghz

Both with the same RAM, hard drive etc.

I was wondering which would be quickest at video encoding. I will be mainly using software such as XMediaRecode, Handbrake, AVIDemuxe.

I'm just wondering which processor would give the quickest encode? I was thiking of getting the quad core but noticed the clock speed is 2.3 compared to the 3.3 of the dual core processor.