You have a choice of 3 connectors, 4 trigger springs, 3 striker springs and a few trigger bars. The first 3 items are CHEAP! Buy them all and have a blast mixing and matching until you come up with the perfect solution.
LWD has just released their newest version of the 3.5 connector. See them here http://bit.ly/nHidAO
Here is a current thread in General Glocking regarding their performance http://bit.ly/pFta1L
(FYI: They are in stock & shipping now)