what's the minimum equipment required to get started?

I have used a Coleman stove to melt lead for my sinkers and .490 round balls for my TC muzzleloader. Not much experience but a start. I reload .38, .357, 9mm, and will start on 44 mag. I only shoot paper and steel targets with the pistols. I am considering casting the .44's. Is it necessary to size the bullets after casting? All of my equipment is RCBS. I see that RCBS makes a sizer/lubricator for about $110. Is there any type of sizer die that will attach to my RBCS Jr. press to allow the sizing and lubricating of bullets? Investing in a lead furnace and thermometer would be useful for the sinkers and round balls, but I'm having problems justifying the cost of $110 for the sizer/lubricator. (Actually justifying this cost to the wife). Thanks for your input.