Need suggestion for sound system

nightHawk12

Contributor
How do I build a decent sound system for room size 18x8 square feet?
I already have a 15 year old computer speakers iball 2.1, the bass is dead now and two more speakers that are larger than typical monitor speakers.
I don't intend to spend more than 20k (maybe stretch to 30k) on it as I don't have much understanding of sound just need good bass and sound for movies and games.

Should I get a readymade sound system from sony or phillips instead?