So I just received my new Mellowtone Hi-Five boost (prototype 1

) and it's not giving me as much gain a I thought it might, it does, however do wonders to my tone; I have so much so definition now and all my dirt pedals sound better but as I said, it didn't give much gain at all so I'm just going to sit it up ontop of my amp and leave it on.
Annnyyywayys, so now I'm in the market for a pedal to give me dirt sound similar to this:
[youtube]http://www.youtube.com/watch?v=_bb7-KKOWCQ[/youtube]
I was thinking about either a Singing Tree or a Groundswell. Or should I go with something more fuzzy but light, like a Low Fuzz?