hey, actually im quite the newbie myself, but learning. from my "newbie" experience I can tell you that it proboly has to do with your mic, do you have a shitty mic? if not, look at placement, room settings, to reverb. Do you have a preamp hookedup? I know you need a preamp. as for micing the amp, sure you can use the line out port on the amp and bring it into your computer. For a cab, I know if i ever were going to record a cab, i would want to do it at full volume!!! ack!! depending on where you live, you might not be able to do this, power limiters can get you that sound, but keeping the volume down. One song coming to mind that was recording with a fulll volume marshall cab is running with the devil by van halen. As for a new amp though, really, almost anything will work, just depends on your budget, and you what soudn you want to achieve. For me, my little marshall 30 watter works just fine, you tune the shit just right, you can really get big sound at a lower volume.