For the most part you want to look at two things when choosing RAM.
On the motherboard page you can see where it says
RAM 1333/1066
That means 1333 should work without configuration problems.
If it said something like 1600 (O.C.)/1333/1066
then 1333 and 1066 would work without configuration and the 1600 would work if you manually configure it.
However, that doesn't address another seriously important issue. RAM often shows up DOA.
The various RAM makers have different track records in terms of likelihood of DOA and likelihood of flawed chips and stuff.
Luckily for you, the one you chose G.Skill is fairly good. Its comparatively far behind companies like Kingston and Crucial, but its still pretty good in general. There are a lot worse brands. Corsair RAM shows up DOA twice as often as G.Skill, for instance.
Anyway, I wouldn't worry too much about the fact that the RAM isn't on the list.
A safer bet would be to get RAM that has definitely been tested and shown to work, like my personal favorite
CT2KIT51264BA1339
or anything else shown here:
http://www.crucial.com/store/listparts.aspx?mfr=ASRock&model=H61M/U3S3
That way you can rule out one whole subcategory of problems (the it hasn't been tested ones) and if you get the above one I specified you can 99.9% likely avoid the other kind too (DOA).
As for the motherboard, as long as you get a processor that is 1155, there shouldn't really be any problems.
Cheap doesn't really mean bad motherboard. Often it just means less real estate and less features. If you weren't going to use that extra space or those extra features then a more expensive board often buys you absolutely nothing.
Asrock has a pretty short track record, but its generally a good one. Asus and Gigabyte have longer ones that are just as good. Going with the Asrock you usually get a cheaper board on account of the fact they don't have the same brand power.
Kinda like how people pay 2x or 3x for have an Apple sticker on their computer as compared to the exact same hardware with a different brand attached, except greatly less exaggerated.
Brands like Asrock and Biostar are usually about $10 cheaper feature for feature compared to Asus or Gigabyte boards, and boards from Foxconn, ECS, Zotac or other unrespected brands are usually going to be another $10 cheaper than that for the same features.
Again, the biggest difference here is going to be the DOA rates and Asrock isn't horrible in that category.