There isn't a really good answer to this.
How many players?
are just a few questions.
I went cheap with my first set of chips. It ended up costing me. After a few months I wanted more, better chips. Had to sell the cheap ones, buy a better set and so on and so on and so on.
Do you prefer ceramics? clays? interested in customs? do you know the difference?
I would recommend ordering samples. You can probably post a wanted thread here looking for different samples of cheap to moderate priced chips.
Check out the marketplace here on PCF. We (well, they) have several vendors that sell chips at a variety of prices http://www.pokerchipforum.com/forumdisplay.php/20-Marketplace
Don't rush into purchasing a set that you will later regret. Take your time, do your research, check out the vendors.
fwiw, I've always enjoyed the hunt for a new set.