There have been great recordings made with much lesser gear than you have on hand now. (imo) you need a good compressor and eq plugin for the bass track. I see you are using Cubase and it should come with those 2 plugins. I've always plugged my guitar straight into the interface. I've tried using a DI box but could not really hear any difference. I've tried the Ampeg amp simulation plugin and it is pretty cool but I like the money it costs more than what the plugin may add. (jmho)