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The only wheels I\ve got with 120mm spacing, which aren't track tubs are a pair of AL30's from Planet X, but the rims are really quite narrow, I'm not sure I could actually get a pair of 32 tyres on them.
I have raced on Planet-X model-b (which I think are the same rim as the AL30) using 33mm Challenge Grifo/Limus without any issues.
Latex tubes are worth using as they are more pinch puncture resistant and allow you to run lower pressues.
The only wheels I\ve got with 120mm spacing, which aren't track tubs are a pair of AL30's from Planet X, but the rims are really quite narrow, I'm not sure I could actually get a pair of 32 tyres on them.