I don't know what your budget is for this project (tires). However, if you have the cash, I would recommended new wheels and tires.
I put 18X8.5 and 245/45 tires on my 2002 SSEi. I am using Michelen HXMXM4 Ultra High performance all season tires. The wheels are ACE monoblock style.
The car has amazing roadholding and handling, plus doesn't seem traction limited for braking anymore. I can still get some tire squeal if i hit them real hard at lower speeds.
As for off the line acceleration, I can't really test that given 3.25Pulley, CAI, and headers/flex pipe with stock transmission.
I will let you know once the intense transmission goes in