I use and can recommend Moneydance. It's a cross-platform, Java-based shareware app that has worked for me through several iterations of OSX and currently works on 10.3.
The current official build is 314, which is what you get from the above URL. The developer also provides 'previews' (interim releases before the next major build) here. The current preview is build 320 which is what I'm using.
Moneydance will import your Quicken data (QIF) file so it's really easy to switch.