Still 6 months till restrictions end but thinking winter may be a good time to buy so I'm starting my research early. Now I've looked at some of the 600cc parallel 4s and they certainly seem a sensible choice but I just can't get that excited about them. Yes they're fast but I don't see a point in paying for performance that I'm probably never going to use out on the road. I do however really like the looks of the Yamaha SRX-6, and thinking that being a single it should also be reliable and extremely easy to work on myself (is this a correct assumption or not?). The SZR660 is also an option, must admit I do like the idea of having an electric start (but guess I could get used to a kick-start). I'll mostly be using the bike for commuting and touring (but will certainly make the most of any twisties I come across) so is it possible to travel long distances on these bikes or is the engine vibration simply too harsh - and what sort of revs are they pulling at 100/110kph?. Also how cheap are these bikes to run/insure and is there much potential for modifying either bike for greater performance (engine, brakes, suspension etc.) when I decide that it's not fast enough. Finally I guess if anyone has any thoughts on why I should/shouldn't upgrade to a 600/660 single instead of a 4-cylinder 600 or a TRX850 I'd be interested to hear them.