About the best bang for the buck is the JD Squared or JD2 model 3. It's a manual bender, but you can easily upgrade it to hydraulic. It will bend up to 2" and do 180* bends. They are $295. The dies vary by size, but are also less than dies for other benders.
I just ordered my own yesterday!
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This ^^^. Check Craigslist for used ones. Another good bender is the Hossfeld. They are much more expensive new, but again check Craigslist. One thing to keep in mind is that the JD Squared is ONLY a tube and pipe bender. It is optimized for this purpose, and so is easier and faster to use than the Hossfeld. The Hossfeld, OTOH, can be set up to bend just about anything within it's capacity - tube, pipe, rectangular, channel, angle, flatbar, etc. I haven't used a JD Squared much, but I've bent up a LOT of sprint car frames with a Hossfeld, and never had a single issue with the bender. Like i said, the JD2 is bit easier and faster to set up a bend (although the HF is easy and fast once you get used to it) and less expensive, while the HF is more versatile but more costly. HF die sets tend to cost more because the JD2 has only 2 cast dies and a retainer made out of bent flatbar, while the HF uses a 3 die cast set. For manual bending (no hydraulics) the JD2 has a ratchet mechanism that is easier to work. The HF has to be mounted to a pedestal base that is bolted to the concrete, and uses a long arm that you pull on.
Finally, there are knock-offs of both bender types out there. Some are decent, some not so much. Unless you have experience with the specific machine, you won't know 'till you try it. Thats why I like sticking with what's proven.