Congratulations, and welcome! welcome call
I'd suggest getting the Fox Float guards for your front shocks. Apparently stones & crap thrown up at your sled can damage the shaft part of the Float shocks, and they will start leaking. These are just (overpriced) plastic guards that hose clamp over the lower portion of front shocks. Easy to install. I'd suggest starting at about 60 lbs for your Floats and go from there. I'm running about 58 lbs. and I think it would be impossible to bottom them out at that pressure. There's a chart with recommended starting pressure for your weight in the Fox manual that came with your sled.
I think I'd ride awhile before getting handlebar risers, the stock bars are quite high. For skis, I went with C&A Razors w/ 6" shapers (that's a lotta BITE compared to the stock skis I'm used to...), but I'm sure the Simmons will be great.
Even with stock bars, I'd suggest hand guards. I have them; this is the first sled I've had them on, and they really help keep your hands warm. You can wear very thin gloves with these (sometimes I ride now with NO gloves when it's warm out), which is a big help for better control.
Another hot item is the Bikeman aluminum belt deflection adjuster for your secondary; you should be able to find plenty of info. on this in other posts. Replaces that cheesy plastic piece that comes stock with the sled.
Tunnel supports and the larger upper idlers are "must haves" IMO.
Set your track tension at at least 1.5", mine really seemed to be binding up as it came from the factory (or dealer) ...too tight.
I got a set of the knee pads, and I'm glad I did. When you're riding hard, your knees seem to bang into the tank on a regular basis.
There's a ton of storage under the seat and in the rear storage area; windshield bags are sure nice for maps and other little stuff, though.
...and just ride. With about 150 miles on mine, it's already really starting to wake up. Some guys spend 100's of hours dinking with theirs, and I think the performance gains they get are minimal, unless getting that last 1/10th of a MPH out of it at WOT on the lake is what you're after. I was expecting so-so performance out of this thing compared to my F7, but I'm really impressed so far. The power, ride, and handling of this sled far exceeds my expectations. After reading about many '07 owners who are not exactly jumping up and down about the performance of their sleds, I'm really, really happy to have the proven 700 motor in mine, thank you. Hope you enjoy yours! :thumbsup: