I want to buy a computer. Which one?

I want to buy a desktop for my ome under 40k to 50k. Not more than this…
i live in bhopal ( M.P.) so suggest which one.
my requirments are:-
good processor
1 gb n vidia graphic
18 inch to 25 inch LCD screen( or led which ever better)
4gb or 8 gb ram
1 tb hdd
Wi-Fi
it should good for gaming( not professsional. Just for timepass)
etc.

so help me. I'm very confused.
i was thinking for mac mini (or imac) but cost to high…

and also for lenovo…

so help…

Buy Dell in that range you will get best one from Dell.

But which model?