performance wise, would be OK to run OSPF, VRF lite/GRE and DHCP on a 3750G?
Some background info, OSPF area is summarised so only a default route on global routing table.
VRF/GRE also just a single default route for VRF lite/GRE (NAC Guest users).
DHCP, just a single DHCP pool for NAC guest users.
More info needed? please LMK