[petek]

Conduit and pipe benders (like the one you linked) would do the job, but you'll be limited to their bend radii, which are pretty much standard. These mostly use a fixed bending shoe, proportional to the conduit diameter - I think code requires at least 6 X conduit dia.. For a "custom" radius, you'd need a different kind of machine. You might find a custom motorcycle shop which could do a custom bend for you.

In any case, at $75 the Harbor Freight machine may not be a bad route if it will do the job. You might pay that much in labor to have tubes bent for you.