At your size and weight, I would say that the 883 Sportster would be ideal. Yes, you would absolutely be able to handle it after a week or two of slow then progressively faster practice. Master slow left and right turns, figure eights, and stopping. Many people, sales dealers included, will point out that an you that an 883 or 1200 Sportster are starter bikes, claiming that many people trade in their Sportsters as they get more experienced for a bigger bike. There is some truth to that but it is not true for everyone. Some keep their Sportsters forever. I would say an early 2000s Sportster in very good condition woul go for around $4500-$5500. But beware, as most private sales advertised in newspapers are on the very high side, especially for anything "Harley." I would recommend visiting a dealer first. And by all means, take the MSF course BEFORE you buy. They supply the bikes, usually 250's, and it is a very worthwhile experience! Good luck and ride safely!