I do not doubt the quality of them at Mr2warehouse, or that he is trying to screw anyone over, like problemmr2 said, im sure he is busy and that 4-6month wait time is a little steep unless you need that time. not to mention the high price :p
I am to meet Josh from chico today to pick up my axle( I cant wait!! lol) but I do suggest finding a shop to do the swap, after thats nailed down buy a setup. I believe Chico sells clips, which would be a good option, if not, I can give you the number to the shop I used, which i highly recomend(1-800-839-4536, if you do use them, specify you want uncut harness and wait for one. takes a week at most), the only downside is they cannot give you an axle. which CRW charged 540 shipped for the axles. so your costs would be about the same as mine were. Im sure you could get it all down for 4k or less if you find a clip with everything.
PS as always, engine, ecu, tranny, full un-cut wireing harness, fuel pump(walbro ~100bucks), rear axles(540CRW, 750stealership), MAF sensor, intercooler(150-900), and labor (850-1500)
edit:: funny, uncut has a "u" in it, wonder how i missed that the first time.