Personally I think one or two of his solo stuff should be rerecorded with Crowded House. Such as 'Hole in the Ice'. It would give some of those great songs more exposure.
Also one of the best Finn songs ever, for me anyway, is 'Message To My Girl'. Now thats quite an obscure Split Enz song for most people (Split Enz albums aren't available in the UK). So revisting that now would be interesting and it would do well I think. Its a classic song.