the best advice for buying computer stuff is buy what you need when you need it. but only you can really make the determination of it you need something. we can help by looking at our own past history and preferences, but we can't possibly match up perfectly.
that said, start looking in hotdeals to collect the things that don't drop in price much (like monitors, keyboards, mice, speakers, etc), and use a pricematching credit card to buy the stuff that does.