I generally concur with the others. Go for BeoLab 3s or 4000s (3s are preferable!). There are some other stunningly good speakers in the B&O range at the moment, but I'm assuming they're out of the price range for a 'first hifi'.
If you're still finding current range of B&O speakers to be out of your price range, then maybe look at some of the older 'BeoVox' speakers. There are some to avoid (particularly those starting with 'X', for example the BeoVox X35. For smaller rooms, BeoVox CX100s or C75s spring to mind, or S30s, but bear in mind there is a probability that older B&O speakers will be suffering from an issue known as 'foam rot' (when the foam ring around the edge of the bass/midrange speaker(s) can deteriorate over time and simply crumble away).
I'd fully recommend Lifestyle-AV if you want to look for something pre-owned. Very good service...