I'd just observe that with the adoption of SANs ( and NAS - although I've not used this ) that disk queue and disk time are not very useful.
The only real counter(s) of value when using SAN disks ( and I think DAS too ) are the i/o completion time counters and the transfers counters. I've used the i/o completion time counters to succesfully problem shoot a SAN and if you do your maths you'll know how many i/o's your array(s) / disk(s) will support. I usually find disk idle time is better than disk time too.
I've never had much luck with network bandwidth counters, I was advised that measurements of the card stats are rarely useful as they won't show other contention or usage on the overall network - I'm not so strong on this area - , typically in n'tier environments there are often other factors at play.
ps don't forget "Sql server 2000 performance tuning - technical reference" ms press , a worthy read.
[font="Comic Sans MS"]The GrumpyOldDBA[/font]