We use DKPSystem.com as well

http://carpediemguild.dkpsystem.com/

I like the service due to several factors.

For the less skilled at web design there is the ability to chose from a large range of pre-made templates which you just drop in using an admin feature.

The customer service has been GREAT, every time i broke something he (one guy owns and operates it) has fixed it for me.

You can customize the look and layout of your page HEAVILY.

Built in forum is nice if not the absolute best, but people can sub in or customize it to solve that.

AND it comes with custome made dkp tracking mod that works WONDERS.
Allows me to track who was online for what kill.
Who was on the sit list for what kill.
Who stayed from start to finish.
Anything really.

Then it ties into a database specific to your guild that allows you to FURTHER track any statistic you can think of pertaining to raiding.
Sit %
Attendance %
Late %
Early drop %
Repaired to full at start %

Just anything, though it doesnt default to track all that.
You can basically make it as robust or slim as you like.

I think we payed a bit over $100 for 18 months, and we just renew it whenever the time runs out.
Good stuff.