New Tank, Sump or refugium?

Hi all,
I currently am running a 45 gallon tank with hang on filter, protein skimmer, and eheim. I am upgrading to a 125 gallon but want to use all my equipment.

Coralife Super Skimmer-Needle Wheel-65 Gallon
Marineland Emperor Bio-Wheel 280 Power Filter
Eheim Filter 2213 - Plus Kit

my question is i want to create a sump or refugium but don't know which would be better for what i have and what I'm trying to do. 125 gallon It's drilled and has a corner overflow. approx 72 inches long. secondly using the equipment above any ideas what i should do to use it or set it up?

also i got a great deal on this light below, only 300 dollars. its obviously powerful enough for the new tank but is quite short, is this going to be okay for the tank or should i have the light raised a lit to get more coverage?

36" 2x 250W HQI metal halide with 6x Bluemoon LED watt True Actinic 03 Blue square-pin compact fluorescent