Get the Lyman Great plains - it's a better buy than the T/C Hawken and is more historically accurate. The Hawken brothers never made a single-wedge short plains rifle with brass furniture - just never happened. Of course, they also never made a flintlock, but that's beside the point as I trust you are trying to avoid registration issues.
All original Hawkens had hammered iron furnishings and were of the 2 wedge pattern. Aside from the adjustable rear sight (they also provide a spare traditional leaf), the Lyman Great Plains is as close to an original Hawken rifle as you can buy out of the box at the retail level. The Fit and finish, while not up to custom levels, is certainly accpetable - I know because I have one
The lyman also has a correctly shaped lockplate and oiled furniture. the lockplate internals, like the T/C gun, are not period though - they are modern coil spring locks that are probably more durable than the originals.
The problems with the T/C guns are as follows (most can be fixed):
-Older guns had hammer geometry problems - a new one would be OK.
-The stock is varnished. Personally I can't live with that, but you can refinish it.
-Brass furniture. Looks great on a Longrifle, but has no place on a Hawken IMHO.
-Blued finish (like the lyman) - some people like to strip and brown them.
-Design. It's a single-band trade rifle, not really a Hawken like their ad copy claims.
If you are actually trying to buy a TRADE RIFLE, which is what the T/C really is, then you can also get the same from Lyman if you want. Lyman makes a Hawken clone (the Great Plains model in .50 and .54) and they also make the Lyman Trade Rifle which looks just like a T/C "hawken" except that the stock is oiled, not varnished.
Hope that helps!

The lyman is slightly less money than the T/C, but the T/C has a slightly better warranty. Don't settle for anything less than these guns for a hawken-style rifle, or at the very least, get them in kit form if you want to save a few dollars. DO NOT buy a CVA or Traditions - you'll regret it as you get deeper into BP shooting.