I don't go as often as I should but Fitness 19 is such a good deal for the price. I got a deal where I paid $199 to start and got 4 personal training sessions and my monthly fee is only $3. (plus the yearly fee that's something like $35 or so)
They have plenty of treadmills & ellipticals and I've never had a problem getting on the equipment.
My only complaint would be that the windows fog up sometimes.