I've been working with MAMP and Coda for about 8 months now and I love it. I'm just working on personal projects so I don't have a need for a whole suite of tools
I like to keep things as simple as minimal as possible too, so if MAMP and Coda works for you, I suspect it might for me too. Thanks.
Have found that MAMP is so much easier to setup and manage than trying to struggle with changing the inbuilt OS X services into a apache/php/mysql development environment.
Other things i use:
Gimp and Seashore (for graphics) Transmit (for FTP/SFTP) Terminal