Power that starts at idle, if desired. Supercharging can leverage freer flowing intake and exhaust, as well as more cubic inches, to raise power, and lower intake temps. For example, moving from 2.25 inch to 3" exahust on my old SCed vehicle dropped peak boost by 2 or 3 PSI, but increased power. On my S4, opening the exhaust is more about reducing heat and allowing more backpressure to be used for boost. For city driving, supercharging is more of a match to the stop and go, low and mid-range RPM stuff. If you need more than 10 PSI on city streets, you could probably go big all motor build, and spare no expense. You've obviously got money to burn on tickets!

2000 S4 Tip
Brilliant Black
Black leather/blue alcantara
Panasonic DVD/TV/Nav (5" motorized LCD)

VAST parts:
K04 turbos
Proper RS4 K04 turbo plumbing and hoses
Piggie pipes
440cc injectors
180 deg thermostat
Bosch 710N DVs
AWE intercoolers
Hitachi MAF and RS4 housing
VAST custom ECU tuning (midrange power)
VAST excellent customer service

AWE Twin exhaust
RH 18X8 forged wheels

Needed:
Catch can
higher suspension height
stiffer springs
softer struts
APR bipipe
RS4 Y pipe
Vast Tip chip
Level 10 tranny rebuild
Quieter exhaust
W/Meth kit set to 12 PSI onset
Rear deck mids
new amps
mounted sub enclosure
Changeover to pirelli P Zeros@ 255/30 18

Best decal/paint lettering on a car:
"Jesus is my co-pilot, and we're cruising for pu$$y"