Hi John.
Well, first yah gotta realise that it is a Tiger. So there is just about a boat load of detail sets you could use. Everything from internal radiator, resin tracks, gun barrels, etc, etc, etc. You could probably spend about $500.00 USD if you wanted to go totaly beserk on it :woohoo: . But here are some links that you might use to check out what there is around for your little Kitty.
http://www.track48.com/shop/product.php?productid=1094&cat=0&page=1
http://www.missionmodels.com/home.php?cat=398
http://www.rbmodel.com/index.php?action=products&cat=c_bm&sub=48B
I believe that Jenny can tell you all about these guys and their great tracks.
http://www.perthmilitarymodelling.com/reviews/48/ww2prod/ww2prod48001.htm
There is also Hauler, a photo etch company that does a lot of 1/48th scale sets, and they have a couple diffrent things for the Tiger I, and I have some of them, and they are great.
And of course there are even more things out there if you search deep enough, but these are the ones that I know of right of the top of my head.
Gary B)