Hi all, Longtime lurker, first time poster. I was just wondering what people thought. I just updated recently from OS X mountain lion to OS X mavericks and the system seems a little bit slower than it used to be. So it started me thinking about upgrading.. I have the base mid 2011 27" base 2.7GHz i5 4 GB ram model, and was shopping around for RAM. Crucial has 16 GB (2x8GB) for $160 .. Is that worth the upgrade? I was thinking of keeping this computer until it no longer functions (or if the rumored retina iMacs tempt me enough...). Would that be the best bang for the buck? I figured RAM would be a good upgrade because when I look at Activity monitor, of the 4 GB of physical memory it routinely uses up to 3.7 GB of it, sometimes, somehow, it goes up to 6-7 GB of memory (I guess it uses virtual memory?). I'm not that great with computers to be honest. I'm kind of scared of doing the SSD upgrade although I've been reading through the forums that people who did that say it's extremely fast and since that's where the speed bottleneck is, and thought maybe I could do it. On my old PC a long time ago, I upgraded the hard drive from a 5400 rpm to a 7200 rpm, and it wasn't so bad. I'm actually quite handy with electronics so I was considering doing it once I move and I'm in a less dusty environment . What are peoples thoughts? Thanks for any input!