WTF!
What would it cost me all in all?
FS and latest Traktor that is.
I've done plenty of 3 deck mixes with final scratch. Its got a really decent loop function as well - so you could load up a loop onto the third deck and it will loop away. To make it even easier you can set the third deck as a slave to the first or second decks, and it will keep in time. Gives you more time to do more interesting things...

Have a look about on ebay - you could get the full version of Traktor 3 and FS2 for around £350 all in.