Amateur inherited an audio system...

Recently I've inherited an audio system. I have no idea of what they are, I have never heard any of the brand names before, but upon checking on the internet I've found out they are somewhat high quality units. It consisted of Meridian 506 CD Player, Forte Forty-Four Pre-amp, Forte Fifty-Five Amp, Velodyne Sub and a pair of Rogers LS3/5A speakers. Some friend suggested I check out Audiogon.com, but as far as I can see most of the stuff are WAY over my head. Now that I found out about their value, my girlfriend is pressuring me to sell it, my question is.. Should I keep the system or sell it? It sounds very nice but my girlfriend keeps saying I don't need anything this fancy. Also, if I am going to sell it, is it better selling it as a system or piece-by-piece? Is eBay good for something like this? Any idea will be appreciated. Sorry for being so shallow, I really don't know much about high end audio... Thank you very much in advance.