Blank canvas, steel sided 40x60 pole barn. Thoughts on insulating, electrical, heating???

Johnny Mac said
Hey all, long story short, I have been planning a 40x60x14 pole building for some time now.
My builder called me with a surprise opening, and its nearly done.

I am a busy guy, and haven't put much thought into "finishing" it with electrical, insulation, and heat.

Opinions on the following?
Insulation
Spray foam?
Roll bat?
Foam board?

Wall finish
Osb?
Obx?
Plywood ?
Rather not drywall

Electrical
External conduit if I do osb walls?

Heating
There is no gas here
Electrical 220 heaters?
Radiant floor heat? I hear recovery is poor and expensive to install...

Obviously not looking to break the bank...so spray in foam may be out...same with floor heating. Just looking to do this logically and not do things twice...or backwards.

Thanks for the opinions all.
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Talk to your builder about those options and see what he says. The guys who built my shop went ahead and installed the insulation and then they covered it with inner metal panels. Once the building was sealed up and insulated the electricians came in and ran conduit around the walls and hung outlets every 10 feet as well as installed all the lights.

I had PEX hose installed in the floor before the concrete was poured and then had a it hooked to a water heater. If you don't have gas you can use propane to fire the water heater. Can you trench over from the house for a water line?