Yup, you nailed the maths. My recent OD install was about $3500 CDN , but I had some help so it's likely closer to $4500 CAD for the average guy. $4500 CAD = $3200 USD.
all kidding aside, to do it "right" and depending on how deep you wanna go on upgrades that window looks something like 3500~5000. i know when i penciled out the OD options (42/46, 2000R, etc) everything tallied out to right there in 5 range for the way i wanted to build it out.
could it be done on a beer budget? absolutely. there's a 518 on offer up right now for $600. i could go snatch that up, cobble together a mount with the scrap box tube i've got cluttering up the shop floor, grab the pact kit, throw a cheapie shift kit at it and slam that puppy home for a smooth G.
always time to do it twice, but never time to do it nice!