try it here. don't cost a thing, its just a testnet using the easy online wallet, have a browse.
http://nxtra.org/nxt-client/index.htmlif you like it, you can ask to get some free testnet coins to play around with, you have to ask for it in the forums.
https://nxtforum.org/testnet/some-testnxt-to-test-asset-exchange/if you really liked it then you may try download one of the many clients that are available.
http://www.nxtclient.org/choose offspring if you want a wallet.dat to be familiar with bitcoin and more user friendly.
or you can wait until everything is released then try it but then it would cost you more to own some nxt.
remember that even for bitcoin, it will one day be only POS after it has all been mined.
NXT - You Decide.