if you domain name often gets miss-spelt, you may want to purchase the miss-spelled version.
if you company may be known by different things you may want to purchase those aswell
for example Southern Stronghold Ltd a locksmith company may purchase southerns-tronghold.co.uk but may also consider:
southernstronghold.co.uk
stronghold-locksmiths.co.uk
strongholdlocksmith.co.uk
maybe location variants
hampshire-locksmiths.co.uk
totton-locksmiths.co.uk
This could go on forever, and you will have to consider what budget you have for this
If you do purchase multiple domain names we can point them all at the same website for you.