Bike to go for is a yamaha TZR50 as they look great as its based on a yamaha R1 and their pretty reliable if they arnt ragged to pieces. What people seem not to realise is that they only have a mincy 50cc engine so dont expect amazing results. Its better than walking and riding a push bike. I was looking into buy an RS50 but then decided to scrap the bike idea and get a car. I didn't actually need a bike at all, everywhere I needed to go was near me. Are you looking for a particular style of bike? Such as super motards, such as the suggested MX50 or actual bikes like RS50s and TZR50s. Also are you looking to buy new or second hand. If you want new... dont bother. 50cc bikes depreciate like your pants being pulled down. A brand new RS would cost about 2200 new and in 3 years time would be worth 900ish. Also because 50cc are mostly used by 16year olds, they are only ever kept for that period until that person gets something bigger or a car. So high numbers of previous owners are common. look around on ebay and search 50cc bikes as theres a lot to choose from. But remember to pick one that hasnt been ragged. So try and find a low mileage one.