I bought a used Wehman for $1,500.00. It's both light weight and sturdy. I paid $600.00 for my 14" Kodak Commercial Ektar which puts the total at $2,100.00 to give you an idea on cost.
For the price range you are looking at I would recommend a used Wehman, Kodak Master or a wooden Deardorff.
Like someone said earlier, Karsh used a 14" Commercial Ektar for his portraits but if you look at his work he always included some of the subject's environment. A 14" is really a normal focal length on 8x10.
Long lenses in shutter for 8x10 get quite expensive.