have 33x1250 17 mikey thompson

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You didn't give much details about your truck. If it's a 4x4 and you go off road, I kinda like to stay with 17's as I have found the extra tire rubber gives more cushion on big bumps. If it's a 4x2 or you plan on staying on pavement, then I think the 20's would handle a little better. For a 4x2, some nice AT's would fit the bill and still let you get off the pavement and "play" a little. I've always been a big Mickey Thompson / Dick Cepek fan, maybe a nice set of 33" MTX's would fit the bill.