I'm using a Zebuon's booster board which gives 16 high power outputs and 16 low. I am going to use 1W/LED (3W RGB) LEDs. They seem quite bright enough.
The high power channels are going for replay knocker x 1, flipper solenoids x 2, other feedback solenoids x 6, RGB flipper buttons and ambient lighting x 3. large fan x1, strobex1