Hello Jay,
Welcome to the Forum—-not by any chance related to our esteemed Editor Neil?
As you have a phase converter you will have rather more latitude in machine selection from commercial sources and chosen carefully, these may prove to be a much better buy than choosing an import built to a price
The phase itself isn't the deciding factor with machine life and build quality, those that were made to provide a living will have been built for the duty and unless they have been driven into the ground they will usually have years of good quality performance left in them.
Be careful of eBay sales though and machine auctions unless you are happy to bid in those forums—the tool auctions in particular operate what is know as the 'Ten Minute' rule that can force the bidding on well after the due time for closing.
Buyers premium, typically 16% + VAT and VAT on the hammer price will push what you will have to pay up by close to 40% on the hammer price
Having said all that, there are still decent machines that can be picked up close to the cost of a new import which will knock the spots off it.
Regards
Brian