i've narrowed down my choice for a new amp head down to two: Rig 1) a Gallien Krueger 400RB3 + a Tech 21 Sansamp RBI + a pair of line switchers to try combine the two into a "two-channel" amp that can have both "channels" running simultaneously. Rig 2) a Tech 21 Sansamp Landmark 300 + the footswitch to allow both channels to be activate simultaneously. i suspect that rig 1 is more versatile & flexible, but rig 2 would produce better tone. i'm guessing that both are fairly reliable. hmmm...i also think rig 1 might be too complex and more trouble than its worth. the landmark worries me because its not that versatile; its only useful for producing dirty tones. which one should i chose?