I'm switching out my Gryphon z87 for the Sabertooth, specifically because I built it as a gaming box and realized that one GPU wasn't enough. The Gryphon can do SLI, but the slot spacing is terrible for air cooling. So keep that in mind, you will only ever have one graphics card reliably on MicroATX. If you're cool with that the Gryphon is a great board. I obviously did not end up being as cool with it as I thought I would be.
Honestly the Dragon Slayer isn't that small, or that cheap. For that money you can get a case that's similar or smaller dimensions and fits a full-sized board. The HAF XB Evo comes to mind. Bench style, fits a full-sized board, setup up specifically to support an H100i push/pull in the front or H110 with 2 fans (H105 only fits 2 fans as well due to the thicker rad). Can easily fit tower coolers effectively drawing in fresh air off the side due to the horizontal bench layout, and then you can get a full-sized board without having to have a massive full tower case.
Just some thoughts. I've been a MicroATX guy for awhile, and always been fine. But the moment you decide 1 GPU isn't enough, MicroATX goes out the window. I'm back to full-sized boards and not looking back.
On the flip side, if you're /really/ sure you're fine with one GPU, why not go Mini-ITX? I literally just finished (about 20 minutes ago) assembling a LAN gaming rig in the Corsair 250D. Great chassis, although a tight fit for cable management. Fits a 240mm rad (H100i only, H105 is too thick, found out the hard way) with 2 fans (I am doing pull to take advantage of the side air filters + positive pressure). Fits full sized GPUs with ease (I put a GTX 670 4GB in it). There are pretty decent boards too, put an i5-3570K + Asus P8Z77-I Deluxe in it. It's tiny but still manages to fit a full-sized VRM section by way of a "daughtercard" that should give me relatively good overclocking headroom (which remains to be seen). Plus that chassis fits a full-sized ATX power supply. Mini-ITX is much more compact than your MicroATX tower, and as long as you're fine being limited to 1 GPU, having only a single PCI-E 3.0 16x slot to work with shouldn't be a problem for you.
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