Martijn. Have you received any help yet? I just got Bandicam, and it is far superior to Fraps in every way, so I can easily record gameplay at any quality, size, etc., that I want. However, I don't think I can spend too much time testing, so my help would be minimal.
Were you wanting someone to record to capture bugs and glitches, or were you looking for someone to make a trailer for you as well? Or do you want both of those things?
I have Windows 7 64-bit
3.11 GHZ dual-core CPU
Nvidia GTX 260 GPU
4 GB DDR3 1337 ram (ok, it's actually 1333, but I felt like saying "1337")
It's not a super great PC anymore, as it represents a fairly standard low-mid-range home computer nowadays.