...but what your cage can do for your monitor.
I agree with both Gary and Chris, although modifications can be made to a large Vision such as you described which may permit species recommended by Matt to do considerably well (as Ridge-taileds are captive-bred, yellow V. acanthurus are likely the better choice over a largely-imported species like a Timor).
Of course, when I speak of altering the enclosure I refer to majorly modifying several primary aspects for proper housing, not simple tweaking here and there. I'd be happy to get more in-depth via private messaging should this interest you. That Vision cage will never do well for a V. jobiensis, however, nor any other Indicus-complex type species.