If most of your shooting is <= 500 yards, and you're not going to drag your rig through miles of brush, desert, or forest exposed to lots of abuse, then the crossfire with the M-223 should be fine.
Study mounting everything straight, even and secure, with no cant etc. Don't be shy about undoing and redoing stuff a couple of times. What seems like a mystery now will eventually be in your bag of common sense and duh, heh.....
I had a cheap Tasco setup on my AR for years that held up fine, and I just mounted it by feel and sight. I still have not shot consistently better groups with my current more expensive gear than I did with that one, YMMV.
If you don't expect to do much snap-shot type field hunting with the rig, I would hold out and get the SWFA SS 10x for a few bucks (about $300 + shipping for one IIRC) more. The glass is comparable to other popular brands in the $800-$1000 range IMAO. It does need a 30mm mount, but the SWFA branded SSALT mount works great with it for about $60.