There are tons of great controllers out there dude... I would recommend just about ANY controller out there before the S2/S4 just on build-quality... That's not even mentioning the even worse part which is the "software integration".
As far as an all-in-one controller that is meant for the same things an S2/S4 is meant for... Vestax is amazing... so's the Pioneer DDJ-T1... And actually my current favorite all-in-one (after the vci-400) is actually a Numark, surprisingly... The 4-track is amazing.
Honestly though, the market is finally going to modular, which I love. Check out behringer's new CMD line... amazing. As soon as that shit comes out, I'm never touching an all-in-one again.
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