Emp..here's what you need to figure out 1st.
1.What type of Cars you want to collect? (JDM, supercar/exotics, racers, f1, muscle cars, sports car)(thx geeamino)
2.Is there a theme to your collection.
3.How much you're willing to spend.
4.Can you maintain them properly(cabinets, Dusting, cleaning, waxing etc).
Next go out to your nearest toys store like the ones in KLCC, TimeSquare to see how a Kyosho AA(Autoart) Hotwheels Hotwheels Elite Minichamps Model looks like. You can then judge the quality and pricing yourself.
Try not buying directly when at these shops cos the price is a killer!!
Look through this forum and you might find that some of our brothers and sister offering you a deal you cannot resist and its value for money!!
Certain type of Car models are licensed to certain model makers only....e.g. you cant expect a ferrari from AA

So you gotta live with Hotwheels(sigh)...of course there is the BBR's(grrrrrrr) which will cost you at least 1k.
Collecting Diecast Models is all abt passion and patience. You need to know exactly where and how to start....and surely you'll end up basking in the glory of finishing excelently.
This forum is here to help you do just that!!!!!
Enjoy Diecasting