Hi Frank,
I was in the same situation a couple of months ago. I really wasn't happy with the results I was getting with my guiding so I decided to give an OAG guider a go.
I bought myself a Orion Deluxe OAG and had my first light with it a few nights ago. The results really spoke for themselves. I was shooting 10 minute subs with perfectly round stars on my EQ6.
I am really happy that I went down the path of the OAG. I think for the price the Orion is great value for money. I don't really think you can go wrong with it however if you are interested in spending more definitely have a look at the more expensive OAG's Guy suggested.
Matt