Just a bit of related information. The 6003 pair are being replaced by the 6004 pair. You still get a seperate amp and CD player, but both are improved. They are reviewed in the November edition of the magazine (out today). So, you may find some stores running low on stock of the 6003s.
Whatever you decide, make sure they give you VAT-free invoicing for export. It is officially called the 'VAT Retail Export Scheme', but nobody is obliged to offer it, so ask first. With the 20% tax taken off, you might be able to afford the newer pair?
However, the single box for the CR603 may well make shipping easier and cheaper.