Your list of pc hardware suggests you have a desktop pc. Is that correct? If so, then a standard ssd would be a better choice.
The mSATA ssd's were designed for use in small portable pc's such as notebooks and netbooks.
I'm a little bit confused about your comment about prices. Are you comparing prices for a small capacity mSATA ssd against a large capacity standard ssd? Which mSATA and standard ssd's were you comparing?