a desktop?

Hmmm, maybe it's time, time for me to check out desktop computers that has big memory capacity and fast connection capability. You see, my laptop has already been giving out signs of retiring soon, thus made me think of getting more reliable unit that can withstand the long hours of my work online. But the thing is, it may cost me a few more bucks than what I am ready to spend. I hope to fork out a little more for that. Any idea where to get an affordable yet great performance computer unit?