Turbos from masterpower are relatively inexpensive and work great.. turbonetics and garett ball bearing units are much more expensive and the extra price isnt always justified...
i personally dont like ball bearing turbos for street use, they arent rebuildable so if you break one.. its a new unit...
wastegate is critical.. like i said, a cheap wastegate will cost you an engine as it might not be able to controll boost and you could overboost your engine the first time you get into it...
a Turbosmart pro gate is expensive but if you are running a single then its recomended.. there are others, TIAL and various US and australian manufactures... (dont skimp in the wastegate dept..)
the intrecooler is not that important.. well it is, but a large chineese unit is almost as good as a medium hihj quality unit.... but as with everything.. you get what you pay for..
ps here is the kit i have fs.