What I did was got a friend to help. I took a level and placed it on my lip extending out to the front of bike while sitting in the riding position. With the level being level measure down to top of headlight, that measurement is the height I went with and it worked well.
Thanks for the advice Del!
'05 VTX1800C Candy Apple Red / Black Cherry Flames / PCIII, Jardine Pipe, K&N Filter, Mustang Seat