If your going to spend the money to port and since your jugs will be off do a topend rebuild at the same time. Its not much more money wise really. Ecspecially if you use us site sponsors for your work. Hit uo Kevin at herr Juggs or Jeff at fast. They can take care of your porting needs and port to your riding style. You can also get all your topend parts from them od me and do the work your self. Its simple. Also if you plan on adding any power to your motor like the porting will do haveing your crank trued and welded is a must. the time it take to take it out and the small fee it will cost to have it done is a hell of alot cheaper than having it split on your brand new rebuilt and ported motor. Its a huge investment. Think smart when you start modding for more power.
Theres many other mods you can do first also before porting. Advance timing, reeds, carbs, k&n filters, pipes.coolhead, ignition.
Build as you can but trust me on this one "dont take short cuts" it will cost you 3x or more if something goes wrong or you lose a crank. Just spend the money and do it right the first time. good luck dude.