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As for your expensive/cheap RAM, depends on the timings mostly. More expensive RAM has better timings (reduce latency etc) and is therefore faster and quicker.

By quicker and faster, you mean less than 10% and probably more like 5% in memory intensive tasks only.
 
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If you have an amazon account you can get a kit.. crucial 2 x 4gig for £35

It's what I put in my Mini. (which is the same as yours)

http://tinyurl.com/7yqdwk9

I didn't bother paying extra for a faster delivery.. it arrived two days after ordering.
 
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