you are taking care of a lot of the mechanical basics which is key when hitting the road for a long trip. Purple Passion is the bike I am building for my wife. It was born out of the short comings we found on a 700 mile trip.
http://suzukisavage.com/cgi-bin/YaBB.pl?num=1453341892/04.2 gal tank mod
http://suzukisavage.com/cgi-bin/YaBB.pl?num=1453431803/0#0The basics of that build and things for you to consider are this....
1. I went mag rims so we could run tubeless tires. This allows for plug patching on the side of a road if necessary.
2. chain conversion so I could match the final gearing I wanted. My target was 10% higher gearing. part from the 16" mag rim and part from sprocket selection. Knocking down the revs makes for a little more comfortable cruising at speed.
3. more fuel...100-120 miles and you need to start looking for a gas station. The options I was was either an aluminum keg style aux tank which is a very viable option and has been done or a bigger tank. I ended up with a Vstar 650 tank at 4.2 gal.
4. windshield is nice to reduce fatigue.
5. consider a mechanical cruise control or throttle paddle at least.
6. I would upgrade the front brake. I am a fan of being able to stop. think about it if you plan to ride the mountains it could be some heavy wear on that stock front brake. I like 320mm rotors and 4 pot calipers.
7. we run vapor computers on all our 650s. The tach is not worth hooking up but having an acurate speedo with a trip meter, clock, total run time, total miles etc is very nice to have. Also with where we put it up under the bars you can see it nicely and not have to look down.
let me know if you have any questions of what we did.