This thread is over a year old, so I'm betting the OP decided by now.
However, as it's popped up and as I've recently moved away from the Bonneville a few ideas that might make useful reading if it re-surfaces in another year:
1. The fuel consumpition isn't bad for a 12 year old design, but the 45-50 mpg average I got from my 2004 790 compares poorly to the 65-70 I'm now getting from a Wee-strom. Range can be cured (I used a 9 litre auxilliary tank, but again the Wee comes with a 300 mile tank as standard).
2. There are weakspots. In 8 years I;
Replaced a wheel due to a snapped/corroded spoke
Replaced a leaking fuel tap.
Had to re-wire the main earth
Got through two batteries due to the above.
Replaced the coil three times
Replaced the silencers twice.
One brake light switch replaced.
Both brake callipers siezed due to corrosion.
Repainted the clutch and alternator covers and rear mudguard.
Had a headed stud corrode and snap on replacement.
Was thinking about needing new shocks.
Replaced many many corroded fasteners.
(also, tyres, chains, snapped cables etc. you'd associate with use)
Most of this is related to sub-Japanese standards of coatings and materials. I had three rides on the recovery truck and countless coil related trips onto the hard shoulder.
3. Tubed tyres with the need to remove the silencers are a PITA.
In 2004 this was an excellent buy and I really enjoyed it. There are examples out there that have never really been used, so I'm betting they can be really good second hand buys. They will do anything and go anywhere given enough time and the right tyres. Buying new however I now believe they are overpriced, in 2004 they cost less than an F650 now the G650 is cheaper. To cure the major niggles using Tiger wheels, a home made loom, specially made exhaust and lots of expensive accessories (stainless bits and a big tank) would make a really good all round bike, but I can't see any reason to go to the effort unless seat height is the driving factor. Wee's, Glees, Vee's, Versys, G650's, Tenere's etc. would all do the job straight out of the box.