Hi Tom,
Since furniture is so expensive here (and generally pretty run-of-the-mill), no matter what you pay to ship it will probably work out cheaper! I've also been tempted to go down the route you're thinking of, having seen really beautiful stuff on my travels. I haven't done it yet but on a smaller sclale (or at least smaller distance), I have bought antique furniture from Britain and have had it shipped with mostly fabulous results (e.g. my wonderful Edwardian mahogany bed - €300 after shipping costs or my victorian oak and velvet chaise longue - €200 after shipping - both much cheaper than Irish prices even compared to regular, boring, bargaintown-style, tat). However, I have had one bad experience involving delivery when I wasn't using my usual shipping company. What I would recommend is find a reputable shipping company (preferably recommended) who will take responsibility for damage or loss of goods. Somewhere like eBay would be a good place to go for suggestions and for finding international shippers.
Best of luck!