Re: Want a digital rig for small gigs
Man, there are lots of options for floor modelers these days! Most of them sound very good with a little tweaking, but they all have their unique features. I think I can help a bit.
Boss GT-8 is the only one I know of that lets you run two separate preamps at once. If this appeals to you, then the GT-8 is certainly worth a look. Like all of the modern modelers, it sounds good, but it requires some tweaking and a lot of browsing through the 100+ page manual to really unlock its potential. I own a GT-8.
Digitech GNX4 has a lot of unique features for solo musicians: a basic mixer (with a mic input), built in looper, 8-track recorder, drum machine. It's basically like having a JamMan in addition to the modeling functionality. The "warp" function is a unique and cool feature that allows you the blend two different amp models to your liking. This is different than the GT-8, which lets your run two separate preamps in stereo or blended mono. The GNX4 actually blends the parameters of two different models into one unique model. The Supermodels pack (available separately) leverages this feature to provide a number of new models which are supposedly very realistic (but I've never heard them).
Line 6 Pod XTL needs no introduction. It sounds like your Pod XT, but is geared towards live performance. You can also take your patches directly from the XT and dump them into the XTL. Probably one of the easiest modelers to get a good sound from. It's got a simple interface, and Line 6's support is very good. It's lacking for features compared to some of the competition's offerings, but there is no arguing with good sound, and I've heard a number of people make these things sound great.
Those are all the modelers I feel comfortable commenting on. The Zoom G9.tt is a newer modeler, and I don't know much about it. Seems to have some cool features, though. The Vox ToneLab gets good reviews for it's realistic modeling and simple interface, but I've never tried it. Hopefully my comments will help some, but the best thing to do is go try out everything you can get your hands on. Try to get manuals for everything before that so you can compare features, and so you have a basic idea of how they work. Without knowing at least a little about each modeler's interface, you will be hard-pressed to get a good sound during a short demo (at least for some of the more complicated modelers, like the Boss).