This is not the first time we've had this subject going on, but I'll post my personal experience and opinion on the two companies, since I've bought my cables from both of them.
1. Blue Jeans - IMHO, these guys are the best. Their RCA-tipped interconnects are totally no-glitz, made with probably the best commercial cabling out there. The RCA plugs are industrial quality Canare connectors. I work in the medical imaging industry, and these connectors are equal quality to the ones we use in multi-million dollar imaging systems. (BTW, we use BNCs, not RCAs, but the quality is equivalent.) Lastly, you can call these guys on the phone and actually talk to the people who make them. They will make them in any length you want If anyone else out there does that, I've not heard of them.
2. Impact Acoustics/Cables to Go: Beautifully made cables, a lot showier than the Blue Jeans stuff, if that's important to you. IMHO, their more expensive "Impact" line is not such a great value compared to Monster, but the lower-priced Velocity line is pretty good. Their customer service is quite good (I had an HDMI cable go bad, and they sent a replacement immediately with no hassles).
Of course, that's just my opinion...I could be wrong