A 32mm tire will sit fine on a 19mm rim. I've got a pair of 32mm Pasela TGs (actually measure 30.4mm) on my DT RR1.1 rims.
If you want a wider rim and don't feel like dropping $150 on a pair of hoops for the Velocity A23s, the Sun CR18 is 22.5mm wide and under $80 a pair, or the Velo-Orange Diagonale is a whopping 25mm wide and only $100 a pair.
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"I feel like my world was classier before I found cyclocross."
- Mandi M.