Boy, you had a tough day .

I would think that while the advice you have had is valid, it's over the top and expensive. My neighbour here (in NL) has just had 2, 2 x 35W Kenwood amps
fitted under the front seats of his Passat estate, for which he has retained the original speakers and some of the original wiring. I am currently looking at Caliber competition amps, which are very compact and some as low as 2 x 20 W RMS into 8 ohms (old fashioned, I know). It's not impossible to locate a good amp, merely difficult. I think it would be worthwhile holding off an install until you have researched it bit more. The line "all head units come with amps" coming from a reputedly professional ICE installation specialist would worry me a lot...

The orange line from the empeg sled is the remote activate line; if you refer to the manual it gives you the maximum source current it will tolerate. Don't overload it....

Have a look at the Kenwood catalogue (at least 2 compact external amps under 40W) and at http://www.caliber.nl for ideas - don't be too heavily swayed by some ICE places (except CCA, of course) as sometimes they are a *leetle beet* too interested in margin...