I know of a number of buyers here in the UK who have been extremely pleased with the shock factory m-shock. I haven't ordered form them myself but I do intend getting a pair of fronts (£600 per pair).
I wasn't aware they only took bank transfer, they have a UK outlet with this website:
http://www.shock-factory.co.uk/m-shocks-home.html Did you contact these guys - +441858 288021? Their address is real - it's a unit on an industrial estate according to google maps. Just looked and this is their order page:
http://www.shock-factory.co.uk/m-shocks-order.html It says you say what requirements you have and then they send you a secure payment page to pay. Maybe that is a card payment?
Importing is always a risk, especially sending money by bank transfer, but it's quite normal in Europe. I imported my Spyder from Germany and paid for it by bank transfer before flying out to collect it. That was 19000 euros

yikes

but I read up on German bank transfers beforehand and they are guaranteed by law. Virtually no-one uses Paypal etc. in Germany - they all use bank transfer. So may not be as suspicious as it sounds.