Hassy stuff is so relatively cheap now that there's no reason NOT to buy it if, in fact, a Hassy is what you really want. If you get something you don't really want, you will still occasionally cruise Ebay or KEH wistfully and will end up buying it someday. No reason you can't spring for an old 500c with an 80, or a 60/100 combo, or even a 50/80/150 as was suggested above.
I think Bronica stuff is great, but there's nothing actually wrong with wanting a Hassy because it's a Hassy. Just don't fool yourself into thinking it'll make great pictures substantially better than they would be with a Bronica, or rescue stuff you're not happy with from being tossed in the bin.
If you're just looking for a 6x6 negative and aren't focused on the gear, I'm sure Bronica would give you fantastic results, and you'd be far less of a gear fetishist than most of us, which is a noble goal. It's just that when I've tried to escape my true desires, they end up biting me in the end. So why fight it if the price is within your reach?
Edit: Brian's point above is well-taken...more $ for film and paper is really where it's at...but I don't know if that's a budget concern for the OP. Plus, if you don't end up wanting to stick with MF, your resale on the Hassy will likely be quite easy and substantially recover what you paid for it. Not to say Bronica wouldn't, but I also wouldn't count on it.