Here's a list I threw together a while back which sounds right up your street. All infantry, no tanks, just lots and lots of guys:
Foot Guard, 1500:
HQ:
CCS, Carapace, Autocannon: 83
Priest x3: 75
Primaris: 50
Primaris: 50
Troops
Platoon 1:
PCS, 4 Flamers: 50
PIS, melta: 60
PIS, melta: 60
PIS, melta: 60
40 Conscripts: 120
SWS, 3x Sniper: 36
SWS, 3x Sniper: 36
Platoon 2:
PCS, 4 Flamers: 50
Commissar
PIS, Lascannon: 70
PIS, Lascannon: 70
PIS, Lascannon: 70
40 Conscripts: 120
SWS, 3x Sniper: 36
SWS, 3x Sniper: 36
Veterans, Carapace, 3x Plasma: 120
Veterans, Carapace, 3x Plasma: 120
ADL, Quad Gun: 100
1497
The general plan:
The Commissar attached to the Lascannon blob. which sit behind the
ADL with the Veterans. The Conscripts move up side-by-side, in front on the Melta blob, with priests attached to each. The
SWS move up on the flanks for vantage points or hide as needed. Psykers go in the Lascannon and Melta blobs.
It's not as many bodies as some lists throw down, but every unit is capable of doing damage, while none are a pivotal enough to scream ''shoot me!'. Small and big units give a balance between target overload and return on buffs.
And here's a link to an article on how to use it:
http://antorsfinest.blogspot.co.uk/2014/04/spotlight-on-astra-militarium-troops.html
Hope that helps.