Take the 1000 you will not notice the weight difference when riding only when digging it out. Stock for stock the 1000 will clobber an 800, even with the 800 being piped,y-pipe,can,head,airbox mod etc a well clutched stock 1000 will still clobber it. Put the same mods on a 1000 pipe,y-pipe,can,head,airbox and your getting the 1000 roughly the same weight and close to the 190/190+hp range. Ride with a nitroused M8 and it still has a tough time when on the bottle going where a buddies M1000 with y pipe,can and clutching goes. I have a modded 1000 with a Boss seat,holz full float rear skid,holz front suspension with floats,speedwerx y-pipe,speedwerx single,speedwerx can,rkt head,rkt clutch kit,vohx mod air box/bra assembly,gutted hood,side vents, flowrites and bullseyes throughout,etc,etc. I would say it is now lighter than a 8 easily and has power like no other for just simple cheap mods done to it. If real power hungry a turboed 1000 is the way to go. My lil bro is around 140lbs and has been riding a full mod lightweight D&D race prepped M8 on the bottle for a couple years now. One ride on mine and what do you think he is buying this year a new 1000. He says he would never go back to a 800 after riding the 1000. He said you do not notice the weight difference at all but he said you certainly notice the power difference the 1000 has. He said he has to be spraying his all the time to go where I go whereas on mine its not throttle to the bar all the time to get to the top like his. Go 1000 you will not be dissapointed.