If you only want to do 6-8 weeks of peptides, then a GHRP/GHRH combo is not a viable option. I personally like GHRP-2 quite a bit (adding in a GHRH like CJC-1295 w/o DAC makes it even better), but it takes at least 12-16 weeks to really begin to experience noticeable physical results.
You may want to look into using IGF-1 Lr3. With quality nutrition and hard training, you will see some terrific results in four weeks (I've seen some use it as long as 50 days, although this is something with which I haven't experimented). I'll be logging IGF-1 Lr3 from Purchase Peptides in the coming days, and there's plenty of other user reports available for this compound elsewhere as well.
Good luck, hope you find what you're looking for.