Filter (canister/sump?) recommendations for well stocked 75g

Growing some fish out in my 55 as I prepare to set up my 75. I am still trying to figure out what I want to do for filtration on this thing, I could get it drilled and do a sump or install a canister on it. The 75 will have 1 super red severum approximately 3" currently, a dozen bleeding heart tetra's, a dozen congo tetra's, and a dozen diamond tetra's and 6 clown loaches 1.5-2". The tank will be used until I move next year and likely move to a 6 foot 125 or if space/weight permits a 180. I would like to run a single canister but if it's going to require an fx5 I may as well drill the tank and install a coast to coast overflow with beananimal drain and use one of my 40 breeders as a sump for less money. Any recommendations on a more moderately priced single canister? My AC70's don't fit on this tank and I would rather not buy new HOB's. So pretty much sump or canister, and if canister which one. Also I do multiple 2-3 50% water changes each week.