I'm not sure that any of the heat presses you're looking at are going to get the pressure that you need. Most of them are inexpensive because of the quality of the build. That's not meant to be a derogatory statement on the machines, but there are more structural welds on the machines, and structural welds decrease the amount of pressure that you're able to achieve.
If you can swing it, cost wise, I recommend considering a machine like the Stahls Maxx press. It's American made and supported, and will give you ample pressure.
If you can swing it, cost wise, I recommend considering a machine like the Stahls Maxx press. It's American made and supported, and will give you ample pressure.