Remo Coated Emperors are great on top, but I really prefer the Evans G2 Coated heads for toms. They just seem to have more "roundness" to them. Remos always sound "plasticy" and "mid-rangy" to me for some reason...especially when you combo the coated emperor with a coated ambassador on the bottom. If you plan on tuning the drums up a little higher that combo can be golden, but for lower-med rock tuning I always dig the G2s way more...unless you are playing through a gigantic system every night...then it is just all about what feels the best to your stick (imo).
That said, I put Remo Emperors on almost every snare I have. Still good sensitivity, but tough enough and with enough added low end for loud rock music. I just really like the way Remo heads sound on snare drums in general.
As far as the felt goes...I would put a strip about 3-4 inches wide or so vertically on the opposite site that I put the port hole...running between about 7 and 11 oclock on the side that has the most "head realestate" left...if you know what i mean. If you dont plan on porting the drum then just do the same only it doesn't matter which side. You want to keep it away from the center of the head so that you get the initial response from the "meat" of the head without the muffler killing the sound right away. That way the felt just dampens the overtones.
If you have ever used "moon gel" or a similar product, you notice that the closer to the edge you place them the more "overtones" you still hear. Closer to the center...more dead sounding and less responsive. The MORE moon gel you use the more dead the sound is. The LESS you use...the more natural overtones. Same idea with the felt. You want to find what thickness sounds best to your ear, and locate the perfect spot for your sound. Its best to go closer to the edge than the center, but not too far out (if that makes sense). Also, whatever you do, if you port the head, don't run the felt right next to the hole. Port on one side and felt on the other.
Hope that helps!
-Adam