Chain drive works for me. I don't think you will find accessory belt sprockets for the bike. Absolutely one of the two best mods I have done.
Ed_L forward controls is also one of the two. Makes freeway cruising MUCH better! Just my opinion. Let others chime in.

Jim

Well, the conversion is really simple, and reversible. High quality chain makes a BIG difference. And the "dry" chain lube makes it less messy. My total cost was around $100.00. I would absolutely never go back to the belt, until optional belt stuff is manufactured. 20K on my bike, original clutch.

I find the belt to be a pretty cool option on the Savage. I like mine and have had no problems but it I wanted a better high speed I would definelty look into it.

http://suzukisavage.com/cgi-bin/YaBB.pl?num=1174239333/0#0

All you need to know. ^
  Id suggest using 17tooth front sprocket. With the 16 the chain gets pretty close to the swingarm unless you run a 45 or larger rear sprocket. Im running 16/43 and like it okay but I've also got a 16in rear wheel so im more in the range of 17/43. If you've got any significant hills around Id go 17/45. It really makes a great difference on the highway. With the belt Id get an uneasy vibration at 60-65mph actual. I dont get to that point until about 70-75(indicated) now, which with the 16in rear wheel is more like 77/78-83/84mph (actual). I dont go any faster than that ever really so its all gravy. I did push it a bit past 90mph (indicated) with my set up once, which is very very near to or slightly past the ton. Fast enough for me.

In any case I vote heavily for the chain conversion for this single reason. While it is much less likely that you'll break your belt while riding IF you do you're calling a tow truck or a friend with a pickup. Very inconvenient and likely time consuming as you wait for your 4 wheeled rescue not to mention the $180+/- to replace the broken belt. On the other hand, with a chain, if you carry a cheap chain breaker ($16 on bikebandit), extra clip type masterlink ($3), and a set of needle nose pliers you can easily repair a chain break in about 10 minutes and continue merrily on your way.

Burn is dead nuts on. I run 17/43 and hauls my fat a$$ fine around town just fine. You know the feeling, you think there is another gear, but there isn't. With the chain drive, it's there. JMHO. ps, still hang with the 883's. My buddies Road King can't just run away from me! They have to work at it. I can cruise at 70 all day and easily bump up to 80 to pass. Cheap, reversible, why not try it???

Biggest front gear applicable seems to be a 17. What is the smallest rear one could easily put on? Let's say I want the highest possible ratio using GS stock sprockets.

that was the first models 1969 and some of the early 70's models, chains have come a long way since then. alot more durable and plenty stronger. many of those older bikes it wasnt even recommended to use a master link, they wanted a rider to use an endless chain. not so now.