I have a really nice Safety-Kleen Model #14 parts washer... has an easy-to-change solvent container and it lasts me about a year or two, depending on how much I use it. To change out the fluid you just unscrew the drain, lift off the basin, screw in the bung plug and return the cartridge to SK for recycling (or they'll come to your house), at which point they sell you a new container of solvent. The cartridges even incorporate a carrying handle. SK will recycle all of the solvent, so it's better for the environment, and the solvent is the traditional parts washing solvent, not the crappy water-based kind. It has a built-in pump and a flow-thru brush on a hose that works well - in fact I've yet to wear out the bristles on mine. The unit is made completely of steel or powder-coated steel and it also has a fire-triggered lid so that if there should be a fire the lid will automatically drop and close the unit. I'd shy away from plastic washers as they would simply melt and add to a fire.
I've owned the thing for over 20 years and it's still running fine... just remember when you change out the solvent to also ask them for a couple of filters and change it when you change the solvent... then keep a spare in the rare case that you clog a filter (symptom will be slow flow rate - only ever happend once to me).
The cart shown, which I also have, is sold separately, but unlike most parts washers, you can then roll it around where you need it... it's kinda hard to move those 15 gallon drum units. When I'm disassembling a motor or something I can roll it right to the car and wash the parts as I bag them.... very handy.
The unit ain't cheap, but it's excellent quality and will last you a lifetime... heck, it will probably last your grandkid's lifetime.
http://s-kstore.com/index.php/bench...-14.html?SID=8a58618a1954462023b9d8cc7e1b5f24