cgminer.exe --scrypt -o stratum+tcp://pool.d2.cc:3333 -u xxxxx -p xxxxx --worksize 256 -g 2 -I 13 --lookup-gap 2 --gpu-engine 1100 --gpu-memclock 1500 --shaders 2048 --

I get approx 750 Kh/s with 1100 gpu and 1500 memory

I'm a new to bitcoin wanna be.

I have two options to setup an machine. Just built an htpc with the following:
i3-2105
Asrock h77m
4gb ddr3
micro atx enclousure.

Or:
1366 motherboard
i7-920 undervolted and pose. Disable 3 cores
6gb ddr3 standard tower

Now I'm trying to get an 5830 or 5850 card to start.  Can I use the onboard video of the sandy bridge without affecting the performance of the Ati card for mining? Or am I better off using an non integrated Cpu with the ati cards?