I can add flavors to the sound by controlling the amp valve saturation and by using some good pedals such as the Sansamp GT2 (can emulate Marshalls, Mesa Boggies and Fenders in different configurations) and by using Chorus, Delay, Fuzz and Tube Screamer, each at the right time. It is very good.
I have the same problem with the volume though since it is at home I have to work with very low volumes but the pedals help to add the warm thick sound.
BTW, I just signed for the site today (March 6, 2008), I live in Belo Horizonte Brazil and look forward to exchanging ideas and guitar information with you all. Cheers! Beck.