Well, that's 50watts more than what I've got in my A2000. Powers 2 floppies, a Supra accelerator, 8MB Fast, 2MB Chip, CD-ROM, 1GB HD, external DCTV and a sound sampler just fine.
In a tower environment, you should be able to add another HD, a fancy accelerator with lots of RAM and a DVD ROM easily before having to worry about power restraints. I'd be more concerned with keeping everything as cool as you can.
