You'll need a high-temp pump. The standard for homebrewing is the march magnetic pump.
If you're going away from a 3-tier design, you need to decide if you want a single- or 2-tier setup. With a 2-tier, you can get away with a single pump as you'll use gravity from the MLT to kettle. With a single-tier, you can still use a single pump if you want to batch sparge, but you'll need 2 if you want to fly sparge.