If I had to choose, I'd probably take the Mustang as well. That said, I've gone a different direction with a practice amp. Several years ago, Atomic Research (now all tied up with Fractal)put out a series of powered speakers that had a tube power amp connected to a hot-swappable bay that would take any of the four modelers that were out at the time -- the M-audio, the Behringer thing that looks like a guitar body, the Vox and the Line 6 Pod. There were adapters for the bay that would secure them into a box that could be swapped in and out of the speaker. In effect, the addition of the modeler turned it into a tidy combo amp, so that all you have to do is walk in, plug it into the wall, plug in the guitar and hit the ON button. In addition, there's an FX loop, so you can plug any foot pedal modeler (or any other preamp) into the FX return. But wait, there's more. Since some of the modelers output stereo, you can run a pair of these in stereo from one modeler simply by running a cable out of the one that houses the modeler to another identical cabinet. It came in three variants: a 112-18 (18W EL84 power amp with a 200W single 12" in a closed-back cabinet), a 112-50 (50W 6L6 powered amp with that same 200W single 12" in a closed back PORTED cabinet) and a 212-50 (50W 6L6 powered amp with two 200W 12" speakers in a closed back ported cabinet that's nearly as big as a 4x12). I've run these with four different Pods -- the XT bean, the X3 bean, the XT Bass and the current Pod HD bean. The 200W speaker is an eminence model designed for fairly wide frequency response (not a guitar-specific speaker with a mid bump and rolloffs at 110Hz and 4000Hz), but it's not FRFR. I added a 400W-capable piezo tweeter (no crossover required) on an L-pad that restores and disperses the highs (no icepick). The Bass Pod XT includes a couple of dozen bass amp models, a couple of dozen cabinet models and a few microphone models, and allows me to practice bass on these amps without risking a blown speaker. The porting really supports the speaker's bottom end. These things will even handle low-volume gigs (churches, etc.) and can work as an onstage monitor (there are DI outputs on the Pods, as well as USB outputs for recording and earphone outputs if you want to run even quieter). I picked up the one I have for under $80. The XT and X3 Pods provide models and FX that don't exist on the HD, and they were cheap as well (both under $100 used when I bought them, and I've had them a long (ish) time). The HD does pretty much everything that the HD500 does except support the Variax guitars. It's smaller and easier to stuff in a gig bag, works better on a desk, etc. You can run a foot pedal (FBV Express II or Shortboard II) out to the front of the stage via an ethernet cable. No AC required, no expensive guitar cables (if you have a wireless, it can stay in the backline with the Pod electronics) running across stage. And you have everything you really need (FX switching, bank switching, channel switching, tap tempo, expression pedal, tuner display with muting) right there. You can bend over or kneel down to make changes on the foot pedal if you want, or you can walk back to the backline and do it standing up on the Pod itself. And except for the 112-18 (which has a slightly slanted top) you can stack them.