Arm/cart matching is certainly critical, but so is cart/phono matching. If you've ever heard a significant mismatch you'd know it, so Stickman asked a good question and his specs provide good examples.
Stickman,
The DV-20XL puts out 2.8mv. Your MC inputs specify a maximum input of just 1.0mv, so clearly you shouldn't use those. If you did you'd have far too much gain. This might overload your line stage and/or amp and/or endanger your tweeters - not to mention your ears.
Your MM stage, OTOH, is reasonably well suited for a DV-20XL. No surprise, since that's a HOMC specifically designed for use with MM phono stages. While the "ideal" gain for a 2.8mv cartridge is more like 41db (according to the
KAB Preamp Gain Calculator), your Hovland's 46db is close enough. You'd have ample dynamics and you wouldn't be pushing the phono stage hard, so its noise level should stay low.
Assuming you like this cartridge and don't mind leaving your MC stepups idle, your Hovland should work fine with it. You might find the sound a little bright (or not, it's system dependent) due to the very high input impedance of your MM stage. That can be adusted by inserting resistors across the inputs, so it's not a bar to using this cartridge.