I'd of course point you to the Trigger Master

and if you want a look at the features list and added info, you can download the manual
here.
One thing that sets them apart is the large number of features and firing modes. Also, the fully programmable nature of the features (no fiddling with pots or anything. Everything is either automatically detected, or programmed through trigger pulls.)
If you're curious about any particular part of the Trigger Master, just let me know.
(PMs or email or posting in my retailer thread are best since I only notice discussion in forum topics if I happen to run across them (like this one) or someone points me to them.)