What exactly do you plan on doing with said system?
Are you buying used or is this a listing of brand new components?
If new then $225 sounds like a decent price considering the amount of hardware. If used, its not a bad price if everything is in perfect working order. Keep in mind that most of the hardware listed is showing some age by this point in time: it will not be very future-proof (which means spending more money in the future.)
Also of note: by todays standards the hardrive capacities are quite low, keep in mind that some new games/programs require over 5GB.
if you put a new hdd, i.e 500 gig F3, that could be worth 75-100$ more, people usually look at amount of ram, hdd size, and cpu speed when they are buying, and thats it. so the bigger and faster those are, the better.