Any number of them I expect :) But since I've been gaming in excess of 20 years now, I've chalked up quite a few :)
I've played pretty much all GWs games at one time or another, going back as far as 3rd ed WFB / Rogue Trader / 1st ed Bloodbowl / Dark Future, play Warmachine (Cryx) and Hordes (Legion) , Battletech (as mentioned), and Babylon 5: A Call to Arms (Minbari and Narn). I think thats about it for my wargaming. I have some Confrontation (Devourers), but it never really took off here. I've also tried getting my local game store to order me in Secrets Of The Third Reich 1949, but no luck on that so far. It looks fun though.
I don't play DBM or any historical figure games though.