i built my interconnects this weekend and thought i'd give a mini-review for those who are considering doing the same. i ended up using belden 89207 twin coaxial cable and used some wbt clones to terminate. the cable was reasonably priced at $2.05 a foot but i was only able to find it for sale in canada so the shipping came out to be just under $20, the plugs were very reasonable - i got them from parts express and they came out to around $3 per plug. i decided to be fancy and cover the cable with techflex, it certainly wasn't necessary but the cables do look more professional and it offers a little bit of extra protection.
construction wasn't very difficult, the only real issue was trying to find a good way to solder the return to the plug. i ended up soldering at the back of the connector, it isn't the best place to solder but it was really the only place that it was possible. the cables seem pretty, i'd prefer if the connectors had better strain relief but other than that they're pretty solid. the cable is very stiff, so if you need something flexible you might want to look elsewhere.
after hooking them up i noticed an immediate improvement, nothing earthshattering but definately an upgrade over the monster and radioshack cables i had been using. i haven't had a chance to sit down and listen critically but i've noticed that the bass seems a bit tighter and the highs sound more natural. overall they sound very smooth and musical, which is pretty much exactly what i was going for.