I'm riding on stock suspension but am looking for new tires with a little more aggressive look. I've added some flat top fenders, any suggestions on how big I should go and what the cheapest route is?

The cheapest route? I think 31s are as big as you can go. I just put 30s on, didn't know what 31s would to my speedometer. BFG ATs, quite and I like them. I don't think there are many 30s around anymore.

Cheap and big = budget boost and small body lift.
Check out the many many posts on this subject.

I just put 31's (BFG AT) on my '05 TJ. Using my GPS unit, I found the odometer to be about 7.7% off (low) and the speedo -- strangely -- just about spot on.

Also, there is a bit more feedback coming thru the steering wheel, not DW bad, but more noticeable than the stock 225/75/15 that I replaced. My suspension is totally stock.

Here's a pic of them:

I just put on the 30 x 9.5 15 and I am fine with them. How does 30 x 9.5 15 compare to 225 x 75 15?

I just put these on my stock suspension 05 RME and they are great.
Mickey Thompson Baja STZ 31X10.5 on Procomp 15" Rock Crawler Series

TDImark, what wheels are those? 31x10.5 is the largest you can run with a stock suspension, from what I've learned over the past couple of months

They're Pacers.

Looks good.

I was going to go the 30/9.5/15 route before a friend of mine offered his larger tires to me which were sitting in the garage unused. It was an offer I couldn't refuse. I like them a lot.

I was using this website for tire comparison, because I was asking the same questions you are: Tire Size Calculator

I was going to go the 30/9.5/15 route before a friend of mine offered his larger tires to me which were sitting in the garage unused.

the 225/75/15 are 28.5 tall heres a chart . http://www.tirerack.com/tires/tirete....jsp?techid=53

Im running 235/75/15 which are 29 inches tall .