I use an older Marantz PMD660 I got off Ebay. It's light, extremely robust, and takes a CF card, also more robust than SD is.
It has two suprisingly good electret mics built in, and XLR fittings with phantom power for external condensor mics. It's very useful at times, fairly quick to start up too. The main downside is battery life, so it's worth usign a power adapter.
It's made for journalists rather than musicians, but that's why I like it, I wanted a general purpose high quality audio device that was all but bomb-proof, and I got one. Buying the older variants is a good way to save what is otherwise a lot of money.