While he does have a point that seperates can make things sound alot better, in that price range, splitting all the pieces into seperates really isn't going to be that much of an improvement. Also I personally wouldn't go with those speakers, as you can find much better set for the long run by finding a good set that fits you. Also, the major gripe I have with his setup is that he is going for a 6.1 surround, and 6.1 is pretty much a dead format. Most current receivers are 7.1 even on the low end these days, and 7.1 allows for much better matrixing of 5.1 which almost all surrounded sources are these days anyways, and most things are still in stereo.
Still he has a valid point, if you find a decent receiver with 7.1 Pre-Outs, you can hook up the speakers directly to it initially, and then as you feel you want to spend more money, you might be able to improve sound by moving to seperate amps at a later time. But initially just buying a good receiver with really good speakers will yield more results. Then perhaps adding separate amps might be an option in the future, assuming you bought speakers that can actually benefit from the change.