how much cash you got?
what kind of sound card have you got on your pc?
do you want a deck and mixer or do you want an (imoho) annoying little midi cup n saucer disk??
you will need a half decent scratchy mixer either way..
deck you could.. if your quite lucky.. get one for around £150 on ebay.
half decent mixer...£100 which would do "for now till the fader bleeds"
then you need a sound card.. you can get them with phono line ins... to hook up the mixer to use with a dvs (digital vinyl system)...
like mix vibes.. or even
traktor pro 3 or something that is crossed overed!
you can get a demo/cr@ck version somewhere like
http://www.egydown.com/2157-traktor-dj-studio.html
then you need the time code vinyl which are £20 or so...
then some carts and needles... £20-£40
get frosted slipmats £19 well worth it
...
or you could just get a deck/mixer carts/needles and one sample record...
to start off with.. hook up your comp to one line on your mixer and play tunes off your comp or flash beat loopers...
well theres my input!!
some one else can tell you how great Hercules controllers are