Yes, you should buy the tarot deck which you feel most connected to, I find it as a very good advice.
All what people above mentioned i found very valid and very good as advice .You should pretty much feel a sort of 'relation' towardthe particular deck you have been attempting tochoose.
You should feel familiar with the aspects it has to represent,or to be related with the path you have chosen specifically.
Whenweperform divination which is a broad magic practice,we should use some tools to help us to tap into our subconscious . Hence, it ishighly recommended thatthese toolswill be related to this so the connection can be strengthened up and thus bring about better results.
What i specificallyrecommend is to have a look in this site http://www.aeclectic.net/tarot/.
( I have seen this site randomly while surfing in the internet looking for interesting tarot sites)
The provides you interesting lists of varioustarot decks ,you can even viewthe deck reviewsor some descriptions about the values it serves.This site got me to find few decks that i really liked in the end.I strongly recommend you to have a look on the various decks and see which one attracts you the most ,since it is very important when it comes to your thoughts and feelings .If you tend tolike something ,you can follow what you feel and purchase it. You may ask for opinions and experiences here from your fellow practitioners.
There are some classical decks, however you should go with whatever you feel. You can also try different decks and see : you will have many of those while being in your magical path.