Here is a complete mapping of the Busiek/Perez Avengers. This includes all crossover issues and makes a nice 3 volume set.
Volume 1
1-6
Iron Man 7 (Live Kree or Die Part 1)
Captain America 8 (Live Kree or Die Part 2)
Quicksilver 10 (Live Kree or Die Part 3)
7 (Live Kree or Die Part 4)
Annual 98
8-12
Rough Cut 1
Volume 2
13-18
Annual 99
0
19-23
Iron Man 21 (Eighth Day Part 0)
Thor 17 (Eighth Day Part 1)
Iron Man 22 (Eighth Day Part 2)
Spider-Man 11 (Eighth Day Part 3)
Juggernaut the Eighth Day 1 (Eighth Day Part 4)
24 (Eighth Day Part 5)
25 (Eighth Day Part 6)
Volume 3
26-27
Annual 2000
28-31
Thunderbolts 42
32
Thunderbolts 43
33
Thunderbolts 44
34
JLA/Avengers 1-4