ring and pinion ratio suggestion

For what I've been reading the bigger the tire's diameter, the better off-the-line traction, because of it's "footprint". Is it right?
My idea was to have 5 equal tires and wheels. The 245/60 R14 are already a tight fit all around. I was ok with opening the wheels arches (flares?) to fit larger tires, but I already have a pair of brand new 245/60 R14 and today I've found a guy willing to trade his wheels for mine (mine's?), so I think I'll trade it, fit my tires for now and just buy a second pair of 245s later. Planning to paint the new wheels and make then look like this:
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