"Harbor Freight, Northern Tools and Lowes have 60 gallons tanks and 2-3 HP motors but don't want to buy one of those and have to upgrade in a couple years."
Harbor Freight's largest compressor has a 5hp motor.It has worked fine for me for over 10 years.
It gives me all the air/pressure I need for a large blasting cabinet.
I am not "pushing" it - choose the brand/model you like.
I'll buy the same unit for my new garage in NC - with a 20% off coupon or when it goes on sale.
"For the bottom drain on Mine, . . "
I took out the bottom drain-plug and put in a solid brass valve with a 90 degree fitting and a hose barb/end.