Newbie quesiton for neanderthals and their sympathizers: I have access to stanley No. 4 and No. 5 hand planes. My goal is to be able to mill poplar hardwood four-square with hand tools. I have budget enough for either a used No. 40 scrub plane or a used No. 7 jointer plane. Any recommendations?
Bonus Question (extra credit): If I buy quasi-smooth but not flat, lumber from a place like Home Depot, can I get away without using a scrub plane?
Any help would be greatly appreciated.