I own Mackie HR624's and love them.

Very accurate and crisp sound.
Its not just the sound either, they are built really well.

the small things like the on\off button on the front, XLR, Phono and Jack connectors all make life easier, not major i know but things you miss when using other monitors

The 824's would be better but only if you have a decent sized room, for my bedroom studio 624's are perfect.

Everyone who has been round here has liked them, quite a few people wanted to buy a pair after using mine hehe