Ive skiied for 30 plus years and the best skis Ive ever skiied on are Kingswoods.They are hand made in New Zealand for NZ conditions (most of NZ skiing is on rocky ground cover )so Kingswood skis are built with thick bases an thick edges. The Kinswood fat skis heaps better then the volkl gothha. but for you I would go the mega fat. Anyway check out Kingswoodskis.co.nz or if that is wrong just google them. You can also choose custom top sheet side wall and base colors.And you guy at back country should see if you can sock these baby

Besides the skis listed above, consider checking out the Moment Bibbys, Moment Comis (and Comi cazi if you like charging), also the praxis pow would be a great reverse camber ski. Talk to the guys on TGR forums, they'll be able to give you alot more help than anyone here.

I don't know if you have your heart set on the skis listed above, but you might also want to look at the BD Megawatts.I second thatI third that, but with an asterisk. Megawatts are way easy and fast in soft snow, but can flop a bit (a lot) in beat up heavy snow and don't have the greatest edge hold on ice. As a guide, you're going to see a whole lot of tough snow. Of your choices I wouldn't hesitate to get the EHPs. Of all the rockered skis I've tried, it was hands down the stiffest and most stable in crappy snow. Hellbents and Pontoons can be difficult to handle on hard snow and suck for skinning. ARGs, Pontoons, and Megawatts all have a mostly cap construction which isn't as durable and more difficult to repair if you beat up your edges. EHPs are stiff, zero camber skis, with a stocky sidewall. Sounds like a good guide ski to me...