Well, his Mad Shack freebie I got is a definite beast, but Killing Fields for me was a heavy yielding high quality smoke. It's not going to get you wrecked though, it's clear and energetic and uplifting. His Herijuana was good and his freebie KO Kush x Jackberry was very nice as well.
Right now I'm running some different gear as the stuff I had was given to a friend who didn't have a clone for me that worked with my schedule (would have had to wait a couple weeks at least). Anyway I am running his Sugar Punch, Extrema and also a Mad Shack freebie.
The Mad Shack is a super beast. Giant rock hard buds that are very resinous. I'm pretty excited but I haven't smoked it yet and it's not on his menu (although he's had many requests for it and if you go to his site and request it the cause will be helped as it seems everyone has great luck with it).
The Sugar Punch looks super promising. I have a couple phenos I think will be heavy yielders. One though is veerrrrry sativa dominant and is going to take a long time. Hard to say how it will yield. Every pheno looks great though in terms of quality and a couple look like they will be heavy yielders and relatively quick (9 weeks maybe).
Extrema has a lot of promise as well. Ultimately I'll know more when I smoke them.
I'd pretty much trust that anything he has created is coming from strong genetic backgrounds and will do as advertised.
His Jack Herer is supposed to be a beast yielder and it wouldn't surprise me as my Killing Fields was a beast yielder.
Kolossus I believe is his "commerical" strain, but has lots of positive reviews all over the web. Might be a good choice for you given your needs.
He might have Mad Shack available as a freebie, you can choose what freebie you want.