A few things --
1) I'm not very versed in all the different 5.1/7.1 music configurations, but I highly doubt clubs use any of them. Generally, the algorithms used to turn stereo music into 5/7.1 are designed to encircle a small area with enveloping sound, not to allow you to use 5 or 7 speakers to get "more" sound. Which is to say, they are not designed to turn 2 speakers into 7 and get you to club-like levels, rather they are designed to put ambient sound into the surrounds creating an enveloping surround field around a "listening bubble" near the back third of a space. Like I said -- this isn't "club-like" sound where the goal is to hear approximately the same sound everywhere in the club.
2) Trying to create two-zones (one around one TV and then another around the second) and play different content on them and then re-purpose all those speakers for a club-like sound is probably going to result in a non-ideal environment for one or the other. For the zones you'll want the speakers mounted close to each TV, but for the club-like sound, you probably won't want them in those same places. Not to mention the fact that to the best of my knowledge most receivers are still only accepting analog for zone-2 video (as opposed to HDMI) and those that do accept HDMI for zone2 (or 3) typically only do so when you want to use the same source input as zone 1.
Having said all that...I think your goals and budget just aren't lining up. I'd focus on one or the other.
If the club-like stuff is more important, then I'd sink money into good subs and high-sensitivity PA speakers with some pro-audio amplifiers in a rack somewhere. Then, just use the TV speakers.
If the TV viewing is more important, then I'd go the two receiver route or look for receivers that actually allow two-zone HDMI switching (I think some of the new Yamaha's do it...?). Then spend just a tiny bit on book-shelf speakers or something to get a nice bubble around the TV powered up for the viewers. You obviously don't want the two TV areas competing and overpowering one another, so it's not like you need crazy powerful stuff here.... Not to mention that audio during a sporting event is mostly dialog and it is not as if you really need subwoofers and crazy speakers to reproduce it well. Then, later on, look into fleshing out the club sound with real equipment built for it. Further, since you mention that you may want music in one zone for people not wanting to watch the game, I'd make the music area zone 1 so if you wanted a small sub in that area to fill in the bottom end of the music a little you could. I don't think zone-2/3 is typically designed with a sub-woofer in mind, most receivers I've worked with only output 2 channel audio to these zones.
Just my opinion....