If you have a typical router just turn QoS on and set your upload and download speed limit somewhere between 85% to 95% of it's max.

I doubt hardly any of you have custom firmware on your routers...

I like this test.

http://www.dslreports.com/tools/pingtest

Should give you a general idea of what pings you will get to other places around the globe and also how much jitter (spike) you have...