If you use Miva Merchant, make sure your hosting company has lots of experience with them. - I have used miva merchant for years and the problem I have always run across is that the hosting company MUST be an expert using their miva merchant software or you WILL have problems. Lots of hosting companies claim to support miva merchant, but in my experience most will not waste too much time solving all of the miva problems. So, be really really careful if you go with Miva that your hosting company has lots of experience with it.