my current specs is i5-7600
8gb ram
gtx nvidia geforce 1060 6gb
psu hexa 550
so any recommended upgrade to make for gaming ? budget around 500sgd
wait, you only intending to change the casing only or making overall upgrades?
Whats your mobo & current pc case?
Also, what games you play?
I'd say if just change case, upgrade graphics card & get another 8gb RAM should be sufficient. In fact, maybe can skip pc case change altogether.
You wont be able to get the newer gen cards but will probably be able to get a 1660ti or something, which will still give your gaming experience a boost.