hello and welcome!
I am also looking at getting an interface and have settled on the "m-audio fast track ultra". this sounds a bit much for you so i would definitely look at a smaller (but just as hi quality and reliable) version of that -
fast track or fast track pro.
i'm afraid my knowledge is limited there but i would have a look at them - they have very good reviews in sound on sound magazine.
regarding software!
well i have never used pro tools but not by accident. when i was looking at getting either cubase, logic or protools i spoke to anyone i could (pro producers, studio managers etc) and the general consensus was as follows:
btw the m-audio is comtaible with both pro tools and logic
while logic has fantastic audio editing abilities the where it really grabs the market is in midi editing. this is not to put down it's audio abilitys at all (they are amazing).
cubase is very similar to logic but the general feeling was that it was always just one step behind logic. cubase grabs the market because it is windows compatible and mac as well. however - that is useless to you cos your getting a macbook!
pro tools is the industry standard for hi end studios and has allot of reputation behind it from over the years. however it doesn't compete with logic in terms of midi sampling or sequencing. also logic is beginning to prgress to a very advanced level of audio capability. the other thing that concerned me about pro tools (apart from the vast cost) was the compatibility issue. there are plenty of options of interfaces, eqs, compressors etc, for use with pro tools, but they are limited as pro tools needs certain hardware functions to allow compatibility. these also tend to be more expensive than general usage hardware options because they are industry standards.
logic in my opinion has the most going for it:
nearly all hardware options are compatible
it's relatively cheep but just as good quality
it has on screen mixing/eq/compression etc so those are not imediately required (u can wait till u need a really good compressor till later) this also makes it very space efficient.
it has great midi sequencing abilities (+ a huge library of optional midi samples)
great audio editing abilities
it has wide compatibility for both commercial and free plugins
another bonus of logic is it is used at all the colleges (at least near me) to teach music tech on.
So, while I can't really tell you about the others I can tell you how I went about getting what i needed and the conclusion i came to.
I (incase u hadn't guessed) got logic and have been very happy now for over a year. I also got a macbook pro at the same time and it is amazing!!!! - good choice.
I haven't managed this (mostly a space limitation) but logic is pretty screen hungry so if u can get or fit a decent external monitor then it might help.
good luck fellow researcher and hope i've been of help (very nice to find someone who is in the position i was a little while ago)