Don't buy a Genisys. I teach Auto Tech at a community college, and we have 5 of them. I would recommend a Hannatech Ultrascan, a Snap-on Verus, or a Ford IDS. If you want to work exclusively on Ford products, get the IDS. There is a VCMII coming out soon that will be priced at $899, with $450/year software.
Anybody that has an IDS or has used one can attest - there's nothing better than what the dealer uses.