Maxima X truncata (Problem, gets to over 4foot wide)
Maxima X alata (needs pruning as it is a fast grower and loves to climb)
Ventricosa X campanulata (dull colour but compact and pitchers look like camps)
"Black Knight" (stays pretty small)
"Dyreana"(my all time fav hybrid, makes huge traps, but can reach large diameter (over 3feet))
I grow all of these and they are happy in low humidity, low light and an array of temps, However Dyreana makes small 20cm traps in less that 40% humidity, but any higher and the 30-35cm traps return, the other hybrids don't care about much and once adapted thrive.
I have only listed these hybrids as they seem to be my hardiest hybrids and have a broad temp tolerance, I am unsure what your temps are (I am presuming 20-25C).
I would lean towards the VentXcamp for an inside plant as the plant is full grown at about 1foot diameter, its traps are not very colourful (some flecks) but the traps look very similar to a campanuata.
Otherwise Ventricosa and maxima should do fine.