Google just hates my site - Help

[Datagg]

Hello, i just signed up here tonight. Here is my dillema

My site is having a terrible time with Google. Id say 3/4 of it is in supplemental. Ive hired SEO people, tried new things, etc and still we are in it. We do come out for awhile, at least some fall off the list, then they come back on down the road.
This is a miva site and we do have all Dynamic links showing as static. We have all our titles in <H1> and description done the best we can for the products.
We have done so many things to try to get out of this dilemma im beginning to go insane at this point.
One thing Specifically I wanted to ask you is about my titles. By a module, each title is listed of the Category or the product shown AND behind it is a slogan that one of the SEO people I hired in the past told me to do, For instance, the product is a "Cut Chemise", so the system would have the title showing "Cut Chemise - Buy Now!" same would go for a category title.
He claimed this would help sales..... But im wonder if this even though the front part of the title changes, the last part "Buy - Now" would or could be throwing it into supplemental as its the same words for all the titles.
At this point im just trying to figure out all angles that may be causing this.
If anyone has the time, or just wants to help a fellow e dude out, please id appreciate all comments and suggestions.

PS I just bought a link in the directory here tonight..I hope that will help
Thank you for your time...

Dan
link removed