Well, I'm sort of a medium format addict, so I'm the wrong person to be weighing in here! But I really don't think you'll regret it if you do get it. Maybe you don't "need" an SLR if you're interested in trying 6x6 format (a TLR is a less pricey alternative), but if the price sounds good, you liked how it handles, and you can swing it financially, then give it a shot. They are about as good as it gets in a medium format SLR, both mechanically and optically. And, I'm sure you can sell it here or elsewhere for close to what you paid for it.
This also happened to me a few years ago -- there was a 500C/M with 120 back, waist level finder and 80 C Planar at my local shop, for $500. I hadn't ever thought I needed a Hasselblad, but at that price I had to have it, of course. I don't regret the acquisition, and I've added a prism finder and a couple of the silver lenses since.