First off, a song dedicated to all the man-whores of NG: http://www.newgrounds.com/audio/listen/1 05771
Now for some advice.
Irregardless of what tool you're using, as stated somewhere in this forum, ultimately, it's not the tool, but the artist. As mentioned earlier, Garageband may have some shortcomings, but there are ways to make it sound better. If you want it free, there's Audacity.
Now, if you've used presets or "rips", AT LEAST acknowledge your source properly. See the comments box on the link I posted for a sample.
You had a nice marketing thing going (others would say it's whoring), but it's no different from the TV ads with claims from some random guy or chick, pushing it's a good product.
I'll be frank with you -- I don't think you deserve to be in the top five or best of all-time YET. If you just want that as an achievement, then you have to earn it with blood and tears. No shortcuts, period.
I only have eight songs up (and two of which, thank God, made it to the weekly top 5), and there were no shortcuts. Those were weeks and ridiculous hours tweaking (and it's still not perfect). I also had to bear ALL the critics (someone once told me I can't sing). What did I do after? Try again and learn. I only marketed afterwards, and I did this LEGALLY via PM-ing my fanbase (yes, I send one PM per fan everytime I have a new release) and the Audio Ads Thread.
I'm also glad meneldil gave me a kickstart by mentioning me in the Underdogs list. I didn't know someone from Poland would like what I did. I also got random PM's, but only AFTER GOING THROUGH HEAVEN AND HELL creating the songs I posted.
Sincerity begets sincerity -- remember this well.
If you want to go to the next level, take it a step at a time. No shortcuts; it'll make a fool out of you (and as you can see, you already have gained notoriety, rather than the attention you want).
Okay, this is too big a post (and has already strayed far, far away from the main topic).
I've checked Apple, and it looks like Cakewalk. Hmm... maybe I'd play with that if I have a Mac.
I'm in <3 with Reason, though. ^_^