Shopping cart Data Import

I have a product data feed that i receive on a daily basis and i would like to integrate this into my website. I already have virtuemart installed so if possible i would like to use that but i am not tied to this. I may have to use a script or a macro to update prices in the data field. the data feed does not include any graphics or links to graphics so if i manually update a product with a graphic then i would not like this overwritten. I might go over 250 dollars for the right solution