I think most hams, even with a legal limit amp, would be hard pressed to pull more than a 30A 240/120v feed would provide. A big amp needs about 20 amps at 240v all to itself. The rest of your computer, accessories, and smaller radios would probably run just fine on a 120v 20 amp circuit but 2 is even better. Most any panel you buy, even a small 6 space, will likely be rated at 100 amps or even 125 amps. The problem is the wire you need to run to actually carry that much load.
If you haven't bought electrical wire lately it's roughly 3 times more expensive than it was one year ago. I'm an electrical contractor and I track my purchase price on every roll of wire I buy. Where a few years ago upgrading a 30 amp feed to 100 amps may have been financially reasonably it might now cost you several hundred or even a thousand dollars (depending on the length) to make that upgrade.