What you need next is a MK4 Deck or what ever deck that you use with your main PC. What system is your PC Running on at the moment so far? If it is win 7 Sweet, that is Awesome because using XP It is not good @ all mate / Madam.
The Herclues MK4 is a very good Deck I have to say.
Cause I have one and it is the best I used so far.
these devices are called "DJ Midi controllers".
They have taken over from the "grams" or "decks" (vinyl turntables) especially for those who play EDM and mix with beatmatching - unless you have a multi channel soundcard already is better to get one of these built in with the controlller.
There are also CDJs which act as both conventional CDJs and midi controllers which you can use with a mixer which is also a midi controller. This can all get complicated and if you are not already a EDM DJ and know about these things then do some research about them. The kit goes from basic cheap stuff to way expensive but its good practice to get the best you can afford. I think that it has made becoming a EDM DJ way more affordable than the vinyl days!
Also the full versions of the software are worth investing in, and don't rob the tunes either - €2.00 for a tune in full WAV quality shouldn't be breakign the bank and with both CD sales gone and zero tolerance stopping live events in large chunks of some countries the artists need their support.
you might also find that running your kit in analogue mode sounds better when doing creative mixing (use your ears, the difference is very subtle!) this may then mean having to use another soundcard or even a separate PC for streaming. if you have the physical space then this isn't a bad idea - its what "proper" professional stations do, one reason being is that should your main computer playing music crash badly, you can still play out jingles through the other one, or talk via a microphone on the analogue mixer or play out some other analogue music from a suitable source whilst the digital kit it restarts. OK you might not have to explain to the Communications Ministry or a large media corporate manager why there is dead air on TX but it still doesn't sound professional..
in Holland many hobby DJ's have built whole studios as good as many of the commercial stations using off the shelf equipment. They do get more holidays from work and college than even other Europeans but even so there are many good practices there we could do worse than to follow.