Looking at these I notice a glaring flaw and a growing trend on boards. Let's assume for a moment that the top-end board is supposed to be the Gaming 9 (I think this is an accurate assumption). Why is it then that the Gaming 9 has /just/ enough room to put two dual slot video cards in a dual-GPU configuration with no gapping between them on a full-size ATX board while the Gaming 7 has an extra slot between the two 8x PCI-E slots for dual-GPU? What would motivate me to purchase a Gaming 9 over a similar MicroATX board when the slot spacing is the same? What would motivate me to purchase the Gaming 9 over the Gaming 7 or a higher-end board from another manufacturer at the top-end if I'm doing dual-GPU?
I know not everyone does dual-GPU, but I find it ridiculous that companies continue to make high-end full ATX motherboards with poor slot spacing that does not take into account the cooling requirements of dual-GPU with open-air coolers. Even their Gaming 5 and Gaming 3 have better slot spacing (although I assume on the Gaming 5 that the second PCI-E slot is probably x4 not intended for dual-GPU in x8/x8 mode). What on earth would motivate a company to fail at slot spacing?
To be fair, the gaming line aren't the "top end" boards. The top end are the big bang and stuff along those lines, the gamer boards are actually gaming oriented and extremely budget minded. If I recall correctly, the 8 series gamer boards sold at extremely low prices at launch, some as low as 115$.
With that in mind, some features may not be present but MSI has a big product stack of gamer motherboards - some have more features than others (as is typically the case with motherboards). Lots of SKUs, lots of feature differentiation. If I had to guess, there will probably be MSI gamer boards ranging from 115-200$, with features depending on the price point.
That said, i'm not really a fan of MSI boards, much more of an asus person myself. Never really cared for MSI baords, but they do seem pretty good for the price - can't really beat some of their baords considering they retail for around the 115$ range for decent features. But the features you're asking for, i'm sure MSI will offer somewhere in their product stack - probably closer to the 150$ range or perhaps their halo parts, which aren't under the "gamer" monkier.