the Quantum is a good kite...but needs wind.
I agree but a Quantum should handle 8-10. It is a little low, but an experienced flyer can take them down to 4-5mph.
If you are thinking of a lighter wind kite, you are probably going to wind up spending more than you will on the Quantum. I know inland winds are not very steady, especially when you are in a confined area. Your best bet might be to try to get to as wide open an area as you possibly can, ideally with no trees or buildings for about 1/2 a mile around (I know easier said than done for most of us) and try some small adjustments on the X's bridal first. Just a little bit, no more than 1/4 inch at a time and make sure the left and right stay EVEN. The adjustment you are looking for will tip the nose in towards you (usually for higher wind to keep the forward drive low) or nose away (usually for lower wind but also to decrease pull at the cost of more forward drive).
I hope I haven't completely confused you...