: ....I always use the GP that cost me I think about $6 :)

Yep, that's one of the chief advantages right there. No question about it.

: Btw, is the OI as straight tracking as I've heard?

In a word: yes. In two words: yes, yes.

: How much room is there under the foredeck?

Front of coaming is 11", and from what I've been seeing and hearing, a size 11 or maybe 12 foot goes in there okay. I have seen two OI's built with one inch of height added to the forms in the appropriate area to house larger stompers. Here's a picture of one of them, built and owned Mike B. in San Antonio.