I'd been racing RC for sometime where Reverse isn't allowed. So, when I got my Savage its was no big deal.
Learn to drive well and you'll find there are very few occassions that you'll need reverse. Since I've owned my Savage (about 3 months), there were maybe 2 occassions where I would have used reverse. Check the Savage Central message board for more reviews of the reverse module.
As far as SS vs RTR. Somewhat similar to you, I work on Road Racing Motorcycles. So, putting together the truck would have been no big deal. But I opted for the RTR cause I wanted to be up and running like now.
Personally, I think if you to pick your own radio and plan on putting upgrades on immediately, I'd do the SS (although I believe the SS uses a 2 shoe clutch and the RTR is a 3 shoe).
If you want to get up and running now, the RTR is good.
Either way the Savage is awesome. Very durable and lots of fun...