I'd be straying outside my competency zone if I tried to offer advice but I think it would help if forum members understood a little better what it is you are trying to achieve and in what way your current solution (still the EOS 1000d with the 18-55 "non is" kit lens I presume) is not providing the results you want.
If the need is for photos on your website then I doubt you'll have any need for really exotic glass in resolution terms. Tilt and Shift lenses are pretty exotic but they do have their uses (see here
) - are either of these uses relevant to your needs.
As you already, I presume, have some product shots hosted on your website it should be possible for you to post a few examples here (see the thread How to post pics
for how that works), both good (so we can see what you are after) and less good (so we can see where you want improvement). So long as you don't include prices and ordering information you won't be attracting the Moderator's ire.