Low and Slow is the mantra for Smoking/BBQ (without smoke it is grilling-not BBQ) - however, in recent times there has been some new thoughts (disputes) on just what "low" is. The old thinking was 225-250 - the new thinking is 275-300. Either way, most smokers agree that "blue smoke" is preferred over "white smoke".
I have smoked a few loins with fairly good success. One of the keys is to not rush them and don't keep checking them or you will dry them out even more. A loin is not a real "moist" cut of meat. A Butt/Shoulder is a much better roasting cut and any ribs will work just fine.
I generally cook them all the way in the smoker instead of finishing in the oven.
The BBQ Brethren is one of the best forums for BBQ - very knowledgeable and helpful people on there from professionals to everyday guys.