I'd go for stock, I've found mine much easier to learn on since I went stock, I'm getting better every single ride, then when I go back on my Mod I find I can do new stuff every time I go on that aswell. Riding a mile is a piece of piss on anything, it only takes 15 mins to walk a mile. Stocks are much easier to ride anywhere though I've found, whenever I go back on my Mod it seems to take forever to get anywhere! What you really need to do is go along to a group ride and have a go on as many different bikes as possible, then you can decide what to get. Although to be honest, you'll end up changing parts all the time anyway, I've been riding 2 years and I've had a T-Pro, a Zona Zip, an 06 Echo Lite short, an 07 Echo Lite long, an 08 Echo Lite Disc long and now I've just got a Kot MS2 aswell as well as the 08 Echo.