I think it's the bigger one. My case is somewhere round about 44cmx30cm - so I think it must be iM2300.
And I think you will find it somewhere in a (Peli)-shop. The biggest "problem" would be the foam. But I think it's not a real problem. Create your own holes with the standard-foam.
P.S.: If your wife knows everything... it's mostly not good for your gear.