Two: road and mtb. Considering a third -- on/off road touring -- but that would be 'paid for' by selling-on the mtb.

Got 4 bikes but only ride the Surly Disc Trucker since it's fine for the groceries/local rides/touring I do. Would be fun to buy diff bikes but I figure to save the money for when touring bike market gets the new tech for reasonable prices.

Way too many! Planned to sell some this past summer but time got away from me. That's a goal for this winter. If I see a good deal on a (used) bike that I think I might like, I grab it. If I like it better than one I already have, I keep the "new" one and sell the other. At least that's how it's supposed to work (upgrading). The problem is that I like all my current bikes, and use them for different types of riding, so I can't decide which to sell. Sigh...

Of course not got have one of each in each category, plus might as well have some 26'ers as well just in case you need a much smaller wheel or need a little vintage.