The girls bike looks pretty good. Those definitely don't command much money. Again, I'd replace the seat and grips. Was that tank painted? I can't recall seeing that style in white. You'd be mostly paying for the boys bike. I think it'd be like a $375/$125 price split. Maybe try to get him down on his price a little. Looks like one of the knobs may be missing on the tank console. Definitely cool bikes though. I have a western auto chrome boys spaceliner and a Sears chrome ladies spaceliner.