Lootas are good as long as you take alot of them and there is another thread about tankbustas that if used correctly can be extremly effective. I like war buggies with twin linked rokkits and taking like 9 kannons with the bs3 they hit like gaurdsmen.
Dont know about battle wagons havent tried them yet and the
sag is pretty freakin awesome but since your footsloggin i would use the
kff over the
sag. Or just take both. Kommandos are cool even though if you take snikrot you cant have a klaw but coming in on their board egde is cool and most likely the people you play will stand stand and shoot till you get there.
Dreads and kans maybe a good idea to cause they could walk along with your boyz till they can get close and start squishing stuff

. Just watch out for the hidden fists