what size of 20 for bd taco

i am looking for the best size and offset for a 20 to be mounted on my 99 tacoma. i will be bagging and stockflooring immediatly after recieving the wheels. i am just not sure on the ideal measurements. i know i will have problems turning while aired almost out but what is the best size and offset to have. thanks in advance for any info.Jason

The wheels I got my for a buddys truck were 20x7.5 +45's stock floored and they fit good