We have a Dake model Y 1.5 ton manual arbor press, which is available for $365 from KBC tools.
We also have a cheapo 12 ton hydraulic arbor press. I would reccomend against this style if it's your only press-it has a lot of slop in the ram.
Check out Page 940 of
KBC Tools. The first two presses on the top wouldn't be bad. Our trailer has the 1 ton press, and it's good for keyways, pressing bearings into plates, pushing pinions off/on FP's. etc.
I'd make sure you get one without a solid base. The rotating plate on the ones I mentioned is nice. Our Dake has a solid base, and it's a PITA-we either have to start the broach, then gradually block up the part as we progress through, or take it to the large 12 ton press and finish it there.
P.S. You won't be able to key a shaft with an arbor press. You'll need a mill for that.