Interspire Shopping Cart into Custom Design

We would like to have interspire shopping cart integrated into our custom designed template, we shall provide the required psd or html siced files for the same as required. we want an expert to integrate perfectly interspire shopping cart into it and host it n our server. we want this work done fast and flawlesly so only people who have done this previously should bid, you can also suggest any other fre shopping cart like interspire which is fully brandable.