What version is your ps2? Is it a fatty ps2 or one of those slim ones. If it's a fatty you are in luck. You need a network adapter. You can either use a modchip with dev1 like the Matrix Infinity or Modbo. Or you can use the exploit method. The only bad thing about the exploit method is that you can't play backup games from a dvd if they don't work from hdloader. Since only a handful of games don't work with HDLoader it wouldn't be much of a problem. But if you are looking for something to do i'd say chip it.
v7 PS2 w/ Modbo 745 (installed myself)
2x8MB Sony Memory Card
Network Adapter + 250GB HDD