Apex Optics Rival 4-32 comes to mind
Or Delta Stryker 4.5-30
or the Nightforce NX8 2.5-20
I will have first hand of the APEX when mine arrives shortly. I can't speak personally on the delta but I hear good things.
I have the NX8 and I love it, all the perks of my ATACRs but half the weight. Low light seems decent as well.