Sorry, but as the Spiders are modeling guitar amps, I think a 'transparent speaker' would not be desired.  I guess an extra DSP section for speaker emulation could be employed.  If you want to use an external modeler, use a dedicated clean amp (keyboard, PA, etc).

I'd like to see:

a way to keep the speaker(s) on when you are using the DI/headphone output.

a way to plug in an external speaker while still using the internal one(s) - there must be a way to adress the impedance issues!

put the headphone/DI ouput and CAT5 jacks on the front panel (Spider 75 and up)

address the continued Monkey problems (not recognizing gear hooked up)

Oh yeah...and use pots with a little more physical resistance for the front controls so they are less likely to move (and "wake up" an undesired setting) from vibration while playing at loud volume.

More M class effects, like seeker and particle verb. Also, put the acoustic amp from the pod xt back. It is really useful and the main reason I haven't upgraded to the hd.

Hello,

Here's something Line 6 could probably add, with a little change to the routing the MP3/line entry is taking today. Assume we plug a mike+preamp in the mp3 input, and the input is routed through the AD converters too (not the case today), Line 6 could then probably model Peter Frampton's favorite effect: Mouth Tube . Could be interesting.

As for people having problems with handles and such: I agree stronger models would be better, especially on the 212 or 2x75W combos. I have equiped my 3 spiders with "Marshall-like" medal handles ($5 each) on the side of the amps, and added wheels. Trust me it's really worth the small investment and can save your back!