Coastalsites? Doorways?

I'm in the midst of a search engine positioning project. I'm doing 
all the usual recommendations -- tuning up my TITLEs, META keyword 
and description tags, page content, submitting to the engines, 
securing my LookSmart listing, etc.

I am close to making a much bigger step -- using Coastalsites.com to 
set up doorway pages (they call them 'focused content pages'). They 
seem credible but I am concerned that I don't have any references for 
them, other than the fact that WebPositionGold's publisher recommends 
coastisites on their website.

Their fee is not small -- for my 80 or so keywords, am looking at 
around $8000. But if they achieve what they claim (top-10 and top-20 
listings according to a formula) it would be worth it because my CEO 
has given us a target of achieving a top 10 rating for at least one 
keyword for each of our 20-some-odd product lines. I don't think I 
can achieve this without doorways.

Anyone have any experience with Coastalsites? Any other hints, ideas?

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