Thanks all!
My budget..hmm..just went through this conversation with my dad. I didn't have an answer. haha
But I won't be buying wheels anytime soon since it's not a necessity (more like a want), but it would be probably max $800 (rims and tires altogether).
My brother, who worked as a mechanic, just took my Teg for a drive and suggested getting a front and a rear strut tower bar. So that will be my first buy.