I am in the market for some new GPS equipment as well. I have tested the Topcon Hiper II and GR-5, Sokkia GRX-1, and the new Carlson (I think it is called the Explorer). By far I liked the technology and compact size of the Carlson setup the best but it has an integrated Data collector and receiver which does not fit my needs as well since I am running 5 crews. The Hiper II and GRX-1 are both very versatile and affordable. For around $20,000 you can have RTK, 2 Network Rovers, Static, dual constellations, and your choice of 5 data collectors and 3 field software. It will be hard to beat that.