price range for view's exposed filter for cck currency

I'm building a site which list private sales of cars, properties and boats. I need a to allow searchers to narrow down search by price range with a drop-down box.

I have cck and views installed. I have added the cck currency module. I can use a views exposed filter to allow searchers to look for a specific price but obviously that' a bit hit or miss.

I don't know if the answer lays with view or cck or something else. I have played around with cck's computed field and can place the value form a currency field into a range but all that seems to do give a computed field value of one range such as '0 - 500'.

Some help would be very much appreciated because I'm going mad on this one.

Thanks.