In my opinion, not worth it. Upgrade the GPU when it starts to lag and it should last you a few years.
1) USB 3.0 doesn't really seem to be main-steam for components yet. And even when we hit a point when keyboards/mice/etc.. are all USB 3.0, they're all backwards compatible to 2.0.
2) Watercooling is for hardcore overclocking, yeah its cool having all those tubes running around your case, but its a waste of money if they don't serve much function. Not sure about Gateway, but I know Dell cuts most/all of the overclocking functions out of the BIOS on motherboards they send out.
3) Crossfire and SLi are nice, but imo not worth gutting your current machine for, grab a smexy single card and call it a day. Depending on budget you can get a single card that will perform just as well as 2x 5850s.
*Edit - Just realized you have an H67, not an overclocking motherboard anyway.
Please read through the thread thoroughly before responding.
Nobody wants to read a wall of text, formatting is your friend.
i5 3570k | 8GB G.Skill 1600MHz | R9 290 | SeaSonic 750X