Well, "future proof" can't really be applied to motherboard or sometimes CPU. There's no need for the Sabertooth motherboard, the only true benefit is the longer warranty. Other features are just perks that you can or can't find useful to you. A Z77 motherboard around $150-180 will offer most of the features you need.
As for the CPU, so far Hyper-Threading hasn't seem to show much advantage compared to the 3570K in terms of gaming and I haven't seen the trend change. So, if this is a mainly gaming build, the 3770K is a waste, you'd be saving a hundred bucks by going with the 3570K instead.
Plus, the LGA1155 won't get anymore upgrades so you lose an upgrade path on the CPU and motherboard so "future proof" doesn't really sound so good when you consider these things.
Of course, if you really like the Sabertooth motherboard then I won't go all out in stopping you from buying it. Just remember that the term "future proof" doesn't really apply to everything (they can be applied to coolers, cases, optical drive and psu but still up to a point)