Well I have ~50 euros to spend on PSU in Serbia , can you recommend me some ? Also I haven't bought case yet , but I plan on buying one with PSU on the bottom , just so you know .
I have NO clue as to prices in Serbia:(
If you are on a budget, it is OK to buy a cheap case.
It does not matter if the psu is on the bottom or the top.
But, the only case I would buy that included a PSU is Antec. Others are mostly junk.
DO NOT go cheap on the psu for many reasons.