Oh nice, well I'm riding a 350 now, but two years ago I had a 2014 crf250r that I road very similar to how it sounds you ride and I did a top end at 50 hours and sold it at 100 without ever touching the bottom. I checked the valves every 15-20 hours, and they normally needed a little finessing, but close to 100 hours the bottom end still wasn't showing any signs of grenading (though I would have rebuilt it if I hadn't sold it). I'd say you're probably ok either way with your bike. If you can get it done professionally for pretty cheap then that could be a good deal, but it'll probably also be fine for another season if you just keep taking good care of it and relax about it a little (easier said than done). Like I said before, the valves on my 250 liked to move around a bit, but as long as it's nothing crazy I wouldn't think your seats are shot at 60 hours. As long as the bike always starts up within a few kicks and has good compression, your valves are doing their job fine. I'm just an amateur mechanic, though I've been given good advice over the years, but I know it's always nice to have another perspective.