Do it. I've used Logic since version 7, and the new features in 8 are phenomenal. Frankly, there's nothing that competes. Pro Tools has to many limitations in LE and is to expensive as HD. The PC software such as Cubase just can't come close to the sheer volume of plugins and features and there's nothing except Sonar that can come close to Logic when it comes to MIDI. Let the naysayers say what they like, but this product gets perfect 10's in Computer Music and Future Music, and Sound on Sound seemed pretty floored even though they don't have a points system.
Go the whole distance and get Logic Studio my friend. Look back in awe at what everyone else has been putting up with for so many years and look on in awe as they still bleat that PC's can even vaguely compete with OS 10.5 and as they lay the continually disproved argument that Mac's are too expensive
Welcome to the future my friend
