Avoid Tiscali.
Zen are getting good customer feedback of late but i personally use Nildram 512k no bandwidth limits.
With Nildram my pings to AH are generally in the 110 to 120 ms range and only taking 11 hops if you discount my router.
It would definitely be worth asking for traceroutes or pingplots from customers of any ISP you consider to compare with these.
If Sprintlink shows in the routing be wary as they can adversly affect your gaming..
Host Information
1,SpeedTouch.lan,10.0.0.138
2,lon1-adsl1.nildram.net,195.149.20.11
3,lon1-9.nildram.net,213.208.106.194
4,lon1-6.nildram.net,195.149.20.132
5,246.ge6-0.mpr1.lhr1.uk.above.net,213.161.78.109
6,pos0-0.pr1.lhr1.uk.above.net,208.184.231.70
7,L1-R1.cwci.net,195.66.224.39
8,dcr2-loopback.Chicago.savvis.net,208.172.2.100
9,agr4-as0-0.Chicago.savvis.net,208.172.3.58
10,acr2-loopback.Chicago.savvis.net,208.172.2.62
11, -------------- ,208.172.1.222
12, -------------- ,216.91.187.39
Sample Information
"02/08/2004 22:11:57",1,34,19,23,20,19,22,116,116,116,121,120
"02/08/2004 22:11:59",1,21,21,20,20,20,21,116,118,116,119,121
"02/08/2004 22:12:02",1,20,20,20,20,21,20,137,115,116,142,121
"02/08/2004 22:12:04",1,67,21,22,20,21,20,115,115,115,132,120
"02/08/2004 22:12:07",1,21,20,19,21,20,20,116,116,115,122,121
"02/08/2004 22:12:09",1,19,21,20,21,20,20,115,115,118,128,120