Firewire/USB Hubs

Anyone know of any good, fairly priced ones? Do these introduce lag ? I'm looking for a USB/Firewire hub. It should be ac powered with the option to be bus powered. It should also have at least 2 USB ports and 2 Firewire ports.

I have been looking around, but I'm not sure what is good and what is not as far as the quality on these things. Anybody know what to look for in a 'good' hub?

u normally just daisy change firewire devices, for usb hubs do a search there are some good threads.

Make sure it has a built in multi-transaction translator, for sure. That will be very beneficial.