I'd love to sell you an enlarger, but the shipping is murderous. I have an Omega c-700 which would fill the bill you are looking for, even still, shipping would be over $100(ouch). An 80mm or 90m would certainly be the lens to use for enlarging 6x6cm negs. Maybe look for a Durst M600(series), they are very good, well built, machines. Vivitar also sold several decent enlargers under their brand that would work for you. I'm sure there are several brands common to your part of the world, hopefully someone there can help you out.