Wow. $300 for an active DI is pretty expensive considering they're all pretty much the same on the inside (despite the spin you may read). I'm actually with Bargie on this in that a Behringer DI is worth trying. I know quite a few bassists who use them and they work fine. If you want to make your own I can post a schematic of one I've built heaps of times (including selling 5 to a recording studio). However, by the time you've finished buying the bits you'll have spent about the same amount as the Behringer. And they have phantom power if required.