if your ultimate goal is clubs then i would highly recommend cdjs + mixer. As it currently stands in the majority of the clubs you will play at there setup will either be using pioneer cdj 2000s or pioneer cdj 900s. Both the 2000 and 900 are quite pricey however, but pioneer also have the cdj 850 range which would be worth looking at. controllers + laptop are great for parties/mobile because of how compact and easy they are to transport, plus they are loaded with features (sample decks, effects etc) to keep you happy, however most controllers have a smaller platter compared to the cdjs in the clubs. I cant comment on the reloop cdjs but i have heard good things about them also, as other users have stated the ddj-s1 is pretty average for the price, the traktor kontrol s4 and the denon controller are great bang for your buck if you do decide to go the controller route