Cool off, Hot Rod!
I think your gonna find the EVO engine has got the punch that you're looking for. Also, the EVO engine is probably the easiest big twin engine to modify, if you need more zip. All of my Harleys (except for a 1200 Sportster) have been new enough to have the Twin Cam engine. However, when I got the FXR2 with the EVO engine, it's power and response really surprised me. I did some minor upgrades (Screamin' Eagle Stage 1 kit, Screamin Eagle pipes, and some minor carbuerator enhancements) and the thing will run with any machine around. It's ability to chug down a twisty road in high gear at 45 mph and still accelerate without shifting or be driving down the 4-lane at 80 and crack the throttle and it still have serious acceleration available is exciting.
I think you're gonna be impressed!
I noticed that your machine has only 1600 miles on it. Mine had about 2100 mi when I got it 2 summers ago. Mine still had the original 1999 tires on it, your's probably will, too. They will be in danger of dry rot, even if they look good. Be prepared to slap a couple of new tires on it, have all the fluids changed, and maybe even look at the battery. As soon as I got home with mine, I dropped it off at my HD mechanic's place and told him to do what it took to get it safe and road-worthy. You'd be surprised at how many of these rare and special bikes just got bought and were looked at and never ridden. I bought mine from the family that bought it new and they just never rode it. AVON Venom X tires are, in my opinion, the way to go.
You're going to love it, but just be aware that it's 11 years old and sometimes having one sit for a long time is worse on tires, batteries, gaskets, belts, etc. that riding it every day.
Ride safe!
Scott