I moved my sump to the basement a few weeks ago using a Mag 18. They claim something like 700 GPH @ 12 feet of head, which should be plenty for my overflow (90 RR AGA handles 600 GPH). This replaced a very reliable Mag 9.5 (slightly throttled down) when the sump was in the cabinet.
I used 3/4 inch inner diameter pressure rated flexible tubing (the double-walled stuff with the mesh in between) for ease of installation -- I think it was like $1.29 per foot at Lowes. 1 1/4 inch spa hose for the return -- that was around $2.79/ft from HD. Total run from the tank to the sump is around 22 feet (about 12 vertical). Considerably more expensive than PVC, but much easier to run through some tight spaces, and no joints to vibrate loose.
Running wide open, I don't think the Mag 18 is moving quite as much water as the Mag 9.5 did, but it's close. Might add another powerhead in the main tank.
So far, so good with the new setup. The tank is running like 4 degrees cooler during the day, and the heaters actually kick on at night. Everything looks good. HTH!!
Regards,