I reckon SV650 then... enough power for a good blast, light enough to handle as a first bike, comfy for longer rides, great engine... the v-twin is great fun with good torque! I can't recommend a v-twin enough as a first bike! Inline 4's under 750cc are generally too revvy for my liking. Plus if you fall in love with the SV650 there are LOADS of mods and addons for it.
If you wanna go cruiser I'm sure Crompsin will have a few recommendations.
Think about it, make a decision, and go for it! Make a good 2nd hand purchase and you can always sell it for the same price you paid... that's what I love about buying 2nd hand.
Got to
BikePics and have a look at the manufacturers listings... browse a few models and see what you like! They split it up nicely into bike types for each manufacturer.
---------- Post added at 08:32 PM ---------- Previous post was at 08:29 PM ----------
Oh and VROOM VROOM!!