Yep, I went with the JBL subs and am very happy. It's tough not being able to listen to the QRX line.
Regarding the tops- this is more of a toss up for me. I heard the JBLs and was pretty impressed. This was just an "ear" test though. I have a pair of the 712m and really like them alot, but for mains I'm definately willing to give the QRXs a try- again, not being able to hear them is tough, but they seem to have alot of positive feedback on them and the qrx over srx rig sounds pretty common.
I do like the idea of matching cabinets and there are others that run SRX gear in my area that I could probably rent to so I do need to take that into consideration I suppose. Also, it seems as though the negative comments I've heard on the JBL tops have been addressed in the newer SRX cabinets.
I do suppose I could rent the QRXs out too, but I'll admit its probably an easier sell to rent out a matching system since most of my clients would be DJs looking to rent.