So the OP just says "if you could get your hands on an indefinite supply"
-- is this a paid for supply (as I've seen some mention and I'm guessing is the case)? or just you know the well will never run dry? lol (I'm OCD and don't like answering things without all the details).
That said, the number one for me is BRITE. I'm going on 3 weeks now without it and absolutely HATE it. I NEED IT BACK.
And since it's 3 supplements; not just individual ingredients, I'm gonna go bang for your buck route and try to find combo options.
So I think I'd say Max REPS for my pre-workout even though I need to add stims, but those are dirt cheap. That has plenty of endurance and if I ever needed to run it during intra, I could do that as well (even though my intra of choice is 5g bulk taurine + Compete).
For number 3, part of me wants to say Ergonine, but I think I'd honestly have to say MyoSynergy Elite. I just need that pump and strength side for one of those 3. So Myo and BRITE taking care of fat loss/leaning and strength/size and then Max REPS for my intra needs.
Always a hard call to choose just 3, though