I would not consider Monster.
Why the Chang Lightspeed? Any direct comparisons with the PC's in my list? What about RGPC 600S (used)? For the $$ the BPT CPC looks to be the best-of-the-bunch based on older reviews. I'll probably go with the HFC-30 version. I was hoping for more definitive reasons to get a specific PC for HT/video, but as is the case the only way to know what you like is to try it for yourself.