Really cant go wrong with the 500m shifting can be fun or can get old just depends on you and if you like shifting.
A auto is fun to ride as well and yes the belt is a wear item but the belt system on the AC is second to none and so long you dont fill it with muddy water all the time it will give many miles of trouble free service.
I would say get as much ride time on the 500m as you can at the dealer to see if you think shifting might not be your thing.
also price you might be able to get a 650H1 for not to much more.
08 650H1 L.E.
LimeGreen/Black, Rad racked, Dual 3" snorkels
Custom 2.5" lift & MP shocks front,Polaris shocks
Custom tie rods
11:1 Wisco & WebCam 417, Dynatech CDI,AMR racing coil,Dyno jet kit
400 oil cooler,Jet-Hot coated header & muffler
Fully clutched BY:PSC: 4.0 gears
Custom gauges & some Limegreen Strobes
Sanny Bushings,Aluminum Skids, Set of 04 floor boards
HL wheel spacer 1" & 1.5", Viper Max 3000
32" Terminators on ITP Black SS212s
05 500m SE,,(soon to be a 700H1)
Custom 1.5" Flex Lift.., Custom Front & Rear S.E. bumpers
Viper Max 3000 winch, HL temp gauge
Dual 2" Snorks ,DynoJet kit, 650H1 cam
SpeedWerx #42 wet springs, SpeedWerx pipe
29.5" Outlaws 10s and 12s on ITP Type 7s