I wouldn't call these my favorites, however, they are possibly my most used:
Am Asus2sus4 Am (Again) Dm add 9 Fmaj7b5
e||------|------------|----------|-----------|-----------|
B||------|------------|----------|-----------|---------0-|
G||----5-|------7-----|--------9-|--------10-|-------2---|
D||---7--|----9-------|-----10---|-----12----|-----3-----|
A||--0---|--0---------|---0------|---0-------|---0-------|
E||-0----|0-----------|-0--------|-0---------|-0---------|
A9
e||---------|
B||---------|
G||-------4-|
D||-----5---|
A||---0-----|
E||-0-------|
While we're on the chord topic, I love combining Am and F like so:
e:-12-------12--------12-------13-------|
B:----13-------13--------13-------13----|
D:-------14--------14-------14-------14-|
G:--------------------------------------|
A:--------------------------------------|
E:--------------------------------------|
This creates a really neo-classical sound. Similar to Blue Oyster Cult's "Don't Fear the Reaper".
Of course
Am > A#m is also a good one.
A minor is probably my favorite chord. In fact, almost every song I write contains some form of the chord. It's kind like home-base for me.
Here is an arpeggio progression I used twice in my song, "Vicissitude"
Dsus2 Gsus2 C5
e:------------------------------|
B:---------------------------13-|
G:-----------------14-----12----|
D:-------14-----12-----10-------|
A:----12-----10-----------------|
E:-10---------------------------|
I call that my Cliffs of Dover lick. That isn't the whole lick that
I play, but what would the fun be if I gave it away?