I use a Fender Rumble 100 which sounds good at any volume. Light as a feather too. Nice vintage tones or more grit if you need it from the onboard toys.
One Control Hookers Green. Lovely little drive pedal. Keeps tone tight and full. £70 inc mainland postage.
Zoom MS60B. Huge range of patches in a single pedal. Extremely versatile and useful. £70 inc mainland postage.
Soundblox (Source Audio) Tri Mod Flanger. Comprehensive range of tweakable flange sounds. £30 inc mainland postage.
If you leave an audience wishing they'd heard a bit more, you've nailed it.
If you leave an audience wishing they'd heard a bit less, you've ballsed it up.