This is the situation I've been in. The other techies at work are upgrading to the new SSD powered Macs, but I don't want to lose the optical drive, and I don't like having a machine that cannot be serviced in any way. I want to replace the dead optical drive with a new blu-ray jobbie, swap the hard drive for something faster, and double the RAM from 8GB back to 16GB (I had an 8GB stick die on me along with the optical drive, because Macs are more reliable than other machines). Cheaper than buying a new machine, I can do all the servicing myself, but the company would prefer I just got a new one. No thanks, guys.
I can't see why the end result wouldn't be just as capable of doing what I already do. I mean, the machine runs Linux half the time anyway - OSX is the slowest system on here, so I'm not that fussed about Mavericks.