I have a harbor freight compressor that I paid less than $200 for. It has no problem seating any of the beads on my tires. I doubt I've ever gone over 80psi to seat a bead. Here's a tip though: keep a spray bottle of water/dish detergent handy to lube the rim and tire. As you are applying pressure, spray the area that needs to seat in. It lubes and helps seal as you go. If it's being particularly obstinate, bounce the wheel on the ground or give it a whack with a rubber mallet. This doesn't do much, but it relieves some frustration at zero harm to anything.
Oh, and keep your fingers away from that bead!
