I bought my C750 from Conics over a year ago now. Brett was responsive to mail, was willing to make a good package-deal (no fixed price) and gave me good support afterwards. My Buffalo Wifi CF was giving me trouble in the beginning, and Brett offered to send me a new one. Luckily in the end, after (re)configuring ( ahum) this wasn't neccesary.
I definitely got myself a new machine at the time, although the C700, C750 and C760 are currently only offered as used ones, with 3 months warranty, and only the C860 as a new machine, with 12 months warranty, according to the website.
The way of payment looked a bit tricky for me at first, because I was used to pay by credit card only. VISA/Mastercard payments are only possible via Paymate, and at the time of my order Brett had a monthly limit of 10.000 USD on credit card payments, which was exceeded on the first or second day of the new month . So I payed via moneybookers.com, which is easy, reliable and fast.
So, in case Sharp comes up with a brilliant new wannahave machine, I would certainly place my order at Conics again!