Hi Parad0x
I've learnt a few lessons on handlebar fitting (or read - I've made a few c0ck ups you might want to avoid)
First, I presume you have the 650 version with "normal" tubular handlebars? (The earlier 600 had "clip on style" two piece handlebars that bolted to the top yoke). Are your Rev counter and Speedo the same size? On the earlier models, the Rev Counter is smaler diameter.
Choose your new bars very carefully. The cable routing, especially for the throttle is an absolute pig. There is very little room to create any extra length (higher / wider bars), or indeed to decrease the length (lower / narrower bars), the cable you have got is pretty much what you have to work with.
When measuring to drill your holes, DO NOT assume that both sides are the same distance from the end of the bars - they are not. Measure, mark, check, then check again before even getting your drill out of the cupboard.
It's very awkward estimating where to put the hole on the circumference you have just marked. In the end use a mark 1 eyeball, the things that are fixed are the switchgear both sides, you can still have the brake and clutch levers set to your preferred angle.
When you're ready to drill, centre pop the spot I have an excellent spring loaded centre pop, press it against the target site and "Presto" centre popped. This helps prevent the drill bit from skating around and making a hole where you don't want it. Sometimes you can achieve this with a wrap or two of insulating tape - put this on after estimating the likely location, then mark out where you want the hole to be.
I think it's a 5mm hole (can check tomorrow if you need), use a sharp drill. If you have access to a drill stand - by far the best option, although I don't (yet!) and managed OK (on 3 sets of bars so far!!!)
Unable to recall the diameter - have you a vernier to measure your bars? If not - I can check tomorrow.
Shop will probably offer a bar rise, measured in inches - This would be difficult to measure accurately but I think I went for 1.5" on the bars that proved most comfortable.
Good luck - feedback on progress is always welcome (if not expected! ;D)
The Renthal Bars are a good choice, I tried a few different heights, they look very good and are well finished.
The bracing tube is a lot smaller diameter and unlikley to be much good to mount anything heavy on, especially a GPS.
The RAM mount supplied with Tom Tom and Garmin (I have a Garmin Zumo) is excellent and includes a fitting to go on the back of your clutch lever. I have mine mounted on te rear of the front brake as there is a heated grips controller on the clutch side. Click on the thumbs for a larger image.
The extra tube on braced bars may obscure your view of the warning lights and can be irritating. Take a look at my Your Tube vids:
uk.youtube.com/watch?v=WcpbZGQmElYuk.youtube.com/watch?v=oOy878v9KKoSomething to think about before swapping beer tokens