tor bandwith ratio

[gabrix]

I'm sorry if recently my tor node argo666tor wasn't always up ... but 
i'm sort of experimenting how much bandwith i have to allocate to the 
tor network.My will is to give as much band as possible without slowing 
down my connection.I'm trying with this 4 rules:
> AccountingStart day 12:00
> AccountingMax 600MB
> #BandwidthRate 100 KB    
> #BandwidthBurst 200 KB

But i seriously don't know witch one is best considering i have a TIM 
adsl flat!
Thanks !