Sounds like a pretty good Ordinary Bitter recipe Scott.
No need for the wheat and 67 is a good mash temp for your recipe. Go for all Styrians - like you said, you'll get a better feel for the hop that way.
The IBUs should be in line with your gravity. I like to have a BU:GU ratio of 0.8 for a bitter. Get this ratio by dividing the IBUs by the last digits in your original gravity. For example, if your OG is 1.036 then your IBUs should be around 29. Should be a tasty drop.