I have to say, I've been playing a trapsin based on jrichard's guide after the death of my summoner and using only gear I've shopped for or found and IMO this is by far the best build out there. Summoner's are safe, but the assassin is way more fun and if she dies, all I need to rebuild her is a few minutes shopping at Anya.
The TK/Orb build is a great build (I use this one to run NM Andy) and with 2x Spirit runeword's this one can't be beat for the investment.