Originally posted by Fran Carango:
AMEN!!!!!!.. 
I thought the criteria was:
"what is the "best" arranger (at any price point) which weighs under 30 pounds. The G70 is 15 lbs over the specified weight...sure, it's a great arranger, but most people who have/had them, have stated it is too heavy; especially in a road case where it would tip the scales at around 60 lbs...yikes!
If you want the "Roland sound", Roland's E-60/50 are far lighter at 29 and 20 lbs respectively, and offer a lot of bang for the buck...so would the newer Prelude and GW-8 as both are under 30 lbs as well.
If it's the Yamaha type sound you want coming out of your speakers, then Yamaha's PSR-S900 which has even more features, weighs under 30 lbs, and has the advantages of SA and Mega voices, and lots of 3rd party support would be your "best" bet.
Yamaha's Tyros3 is 33 lbs, and over the limit...so is Korg's PA2XPro(39 lbs).
Korg's other offerings, the PA-800 at 29.3 lbs, is a contender, but I really can't recommend it because I have only heard the demos and have not actually played it...same goes for the Korg PA-500.
The topic question asks what is the "best" arranger at any price point, but, remember, there is a weight restriction.
Ian