The CSI linked one is probably the cheapest regulated iron Ive seen, if it doesnt use standard tips, it could be a pain finding replacements, but ive had good luck with CSI brand stuff, I have their 400W hot air pencil for $80 or so it performs very well.
If you upped the amount you wanted to spend, $150 would get you a weller 50W regulated iron, $300+ gets into the nice 80W higher quality irons. (I use a WD2 base station with 2 80W irons at work) and you start getting into Oki and metcal for higher end stuff. Ive not ran into anything I couldnt do with the WP-80 irons, upto 10 AWG wire with a typical sized chisel tip, and if I put the fat chisel tip on, even larger wire, or for soldering 10AWG wire into oversized pins without overheating the whole thing.
I have used OKI stations, but not for anything demanding enough to say anything one way or the other, just though hole PCB work with standard pads, nothing demanding like tiny SMD stuff on big power planes where tight regulation and power delivery are important. Their tip change is just using a silicone pad to pull the tip out and push in another, nice and easy. I havent use metcal at all, but always hear great stuff about them.
All the prices I listed above are all new, keep and eye out, and you might find something very nice for a not so bad price.