I have had KYB shocks on several vehicles now. But I would probably avoid the G-Force shocks if possible. in had the Excel-G (the old name for the G-Force shocks) on my wifes 05 Altima and I wasn't too impressed with them. I thought they would be an upgrade over stock, but they were basically equivalent to the stock shocks.
On my Burban, I have the KYB Monomax shocks and I like them a lot. I searched high and low for the best deal and it's roughly the same at Rock auto, and Kyboutlet.com
Well, depending on how much you order. If you are getting all 4, then the shipping adds up at Rockauto, but at Kyboutlet, they usually have free shipping or 99¢ shipping for orders over $100. The Monomax are about $55-$60 each if I remember correctly.