1. Congrats, sounds like a sweet rig!
2. You do not need three pots to brew all grain beer (I use two and a cooler).
I started with a 30 quart pot for HLT and BK and a small cooler as a MLT and made great beer!
3. It seems like you got a nice MLT. You need a brew kettle that is at least 30 quarts to boil your wort after mashing/sparging from your Megapot. Three pots with burners is quite a luxury to me and although nice, they are not necessary for all grain brewing!
4. Bringing 6+ gallons of wort on most kitchen stoves is a challenge. Are you gas or electric? I suggest getting nice propane burner and start brewing outside. It is nice all year round, because your drinking beer!
Are you looking to do this on the cheap, or do you have some bills to throw around?