what are aceptable CPU & MOBO temps?

The computer should be fine as long as you're not doing any overclocking or keeping it in a confined space.

If you do plan on doing any overclocking, I would read some guides before going for it. Other than that, you shouldn't need a case fan, you're good2go.

p.s. Agreed on the 70c and below rule.
 
Your temps are fine.

Addition of any hardware will increase System Temperatures, and to be honest, you local electronics store will sell a case fan for <£5 so just to keep temps down, install one, you not spending a lot of money.
 
What Jake said.

Those are just idle temps, I assume, so obviously they'll be low, and yes, new hardware will increase the temps, but not by a drastic amount
 
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