A couple options come to mind, with good smallmouth fishing a prerequisite:
Enter at Slim lake out of Ely. There is a portage of about 100 rods but it is about as easy as a portage can get, nice flat trail. There are 3 campsites on Slim, all pretty good. The middle one is the best. Very good smallie fishing. Also a shot at some walleye. There are daytrips to be had on the smaller lakes beyond as well (Rice, Hook and Keneu) as well as a few more campsites. Very easy trip.
Homer Lake entry point. Canoe across Homer and actually enter the BWCA about 3/4 of the way across. There are a couple sites outside of the BWCA on Homer and one inside. But I would take the two north portages over to Vern Lake, both very short and easy, the worst thing is you could encounter a little mud on the first one. Two campsites on Vern, both good. The one on the north shore is a very nice site and right across the lake from the mouth of the Vern River which would be a really nice daytrip adventure for you. Excellent fishing for walleyes and smallmouth in both the lake and the river.
Here is a trip report from that area:
Homer to Vern, smallie heaven A third option involves 4 portages but all pretty short and easy. Enter at Lizz Lake(gorgeous lake) after crossing Poplar. Portage into Caribou and then west to Meeds Lake. There is a pretty little river like paddle between two short portages and then you are into Meeds. Three campsites to choose from. The second island site is very nice and we caught a lot of fish from shore. Very good fishing for smallies and some walleyes too. Wouldn't be all bad to stay on Caribou either, a little busier but some nice campsites and good fishing. Then you could daytrip to Meeds.
For fishing, scenery, daytrip options and ease of entry, Homer might be your best bet although the others would be good too. Have fun.