Whichever ones you decide to get, the potential for the best deals comes from the 2x media. If these are sold on ebay you can make a few pounds a spindle
So it depends on what your business venture is. If it's selling cheap DVDRs on ebay, than the one I mentioned or www.discountdvdr.com who are selling Princo White Labels (battered boxes, sold as B-Grade but mostly OK) for 16p a shot are good money-spinners.
If it's actually writing on DVDRs then something better is probably called for. Although to be fair I have had zero issues with the Infinitis -- much of the perceived knowledge out there is based on hearsay and prejudice, but it's up to you ultimately how much you want to spend.
Whatever you do, and I warn you here from bitter experience, DO NOT BUY OVERPRINT DVDRs. Far too much trouble. Strangely, most of them are Riteks, but just don't do it. OK?