Anybody can point me to a good comparisons...

I need to see comparisons between Cubase, Protools and Cakewalk. I need a software that allows me to record vocal, midi sync, etc.

I also need a good comparison between audio interfaces. I've searched high and low and I've gotten myself confused. Thanks for the help.

All three of the apps you mentioned do the same things, they just flow a lil differently. The functions and the differneces between each of them can be found at their websites. Which one will suit you best is going to be up to you. You'll get all kinds of opinions from users from this site about why you should use the software they use but you'll only be able to decide what's best for you by trying them out. All of them have demos available(except Pro Tools unless you're running Windows Me or 98), dl them and see what you think of them.

Once you've settled on the software you can narrow down your choices for hardware cuz not all hardware will work with all software. If you already have a pc you plan on using then your choices could be limited even more. Like I said all three apps you mentioned can do all the things you want to do, all of them are great apps, you're gonna have to try them to see what you think about them.

Cubase and Cakewalk are very similar. It comes down to personal preference choosing between those two. I prefer Cubase myself because it's a bit easier on eyes in my opinion.
ProTools is a diffferent story. It only runs with Digidesign hardware, so you're not free to pick any soundcard you wish. It also uses a different format for plug-in (3rd party) instruments and effects.
Effects and intruments for Protools are not as plentyfull as for Cubase/Cakewalk, and also a bit more expensive.

Then I guess Protools is out of the question, beacause I'm getting the EMU 1818m audio interface for Christmas. But I've been hearing a lot of good things about Cubase. I'm going to have to try the demo version and see what's good.