I started using FL without any prior knowledge of composition at all
Actually, I've been using it off and on for four years.
Isn't my work great??
~Sadface~
Impressive. ~
And as for that other piece of software, what is that? (Edit: Not GarageBand. Not my cup of tea.) Think I could pick it up? :3
Logic Studio 9 (US$499, update likely within a year on Mac App Store). Very good deal for the money - 50+GB of loops, software instruments, and application suite all in one box!
Logic Express 9 (I know one person here uses the previous version) is US$199 and offers the same interface and quite a few of the AUs. It doesn't come with the extras (Mainstage, Waveburner, Compressor, GarageBand Jam Packs, a BUNCH of Apple Loops) however.
Note that Logic does not support VSTs or FL project imports, so to get data over you'll have to convert them to MIDIs, import in Logic, and reassign instruments and effects.
Also, there is quite a learning curve, even from GarageBand. It makes quick sense though.
Lastly, I doubt the next version will get an upgrade license for us previous owners, so Academic boxes (which are cheaper and for uni students, but non-upgradeable) may be a good option. The Express version
may get discontinued upon the new verison's release, though, going by what happened to Final Cut Express (Apple prosumer video editing product - it sucks) once Final Cut Pro X was put out.
I also find it funny that you switched over to Mac OS (or iOS) for that post. :V