I will start by saying that Traditions makes an ok, perfectly functional rifle at an entry level price point.
Given that it sounds like you are just testing your interest and only plan on shooting some paper, at least for now, the model you ask about would suit your needs.
Yes, there is better quality, better built, better finished models out there. Some have mentioned the Lyman Great Plains. If you could find a used one with a good bore for the price of a NEW Traditions you would have a little better gun.
Having just placed an order with Lyman I can tell you that the 2016 prices for new guns has gone up "considerably".
A new GPR will run you 900 bucks. Their Trade Rife, which is another nice offering will come in at almost 700 bucks. The Traditions Hawken will be on the shelf for about $650 - having a Canuck Buck worth about 70 cents US is really going to hurt this year.
PLUS, with the Movie Revenant hitting the screens in a couple of weeks, if it creates even a little of the craze that Jerimiah Johnson did back in the 70's you can count on the sidelock makers jacking the price up a bit if "everybody has to have a gun like Hugh Glass had in that movie".
You are in a tough spot to give advice to. If you "love it" and stick with it you have invested a chunk of money in a rifle that you will quickly outgrow and want something better. At that point your used rifle will be worth maybe half of what you paid for it and the resale market is very small, so you can't easily translate it into your next rifle without taking a loss.
On the other hand, if you buy something better and then decide it's not for you, then again, you have the cost of a good centerfire rifle into a sidelock that again, you may take a bath on if you want to sell it.
Whatever you decide on I would stick with a 50 cal. If you do want to sell it later the caliber is popular enough and even in Canada you can generally get "stuff" for a 50.
One of my sidelocks is a 38 cal. Supplies for that come from my once a year trip down the States to a muzzleloading fair - so pick something you can get supplies for.
I should have added. The Kentucky has the slow twist (1:66) barrel on it. That will pretty much restrict you to "round balls" - not a big deal, but again, in the resale market if it is not suited to conicals or sabot's, again, the market gets real small because there is a whole slew out there that think you need something more than a roundball for deer. For 70 more bucks (Cabela's) the Hawken Woodsman with it's 1:48 twist opens things up to all types of projectiles, increase the range of use (hunting) with the rifle - at least in many shooters minds.