A bunch of great advice here so far on a press.
I will say this about the "H" press, or presses in general - I have seen so many people over-build them from the bottom die on down to the floor.
These are NOT power hammers - they need no extra mass to absorb shock, only enough to resist the stress of the cylinder with good welding.
I say this in reference to Ed's mention about the larger foot print of the "H" press, and taking up more space in the shop.
You can use that to your advantage!
As long as you have a larger foot print, give it shoes! (Or, wheels!)
Then, you can roll it out of the way whenever you like.
This frame and "anvil" area are over 3/8" high strength 4X6 tubing and is so strong it's hard to describe.
We just welded on 1/4 tubing out the four directions to put legs and wheels on it.
Another advantage to the "H" press is that more of the energy is directed into the work piece and less is diverted into frame flex.
