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What speakers do you have? Maybe get an AVR with preouts and then a stereo amp to power the front pair? or get a source select switch so can have front speakers connected to an AVR and stereo amp so can use the stereo amp with music.
Absolutely for sure that 2 channel integrated combined with an AVR will sound better for 2 channels, no question.
An AVR is basically doing the job of 2.5-3 stereo amps (7 channel AVR vs 2 channel stereo amp) and then combine that with the cost of all the licences (DTS, DD, etc) and add a DAC to the question and you can see that a significantly cheaper 2 channel amp just doing 2 channels, with no decoding, no dac, etc will massively outperform it.
The issue is then you have a lopsided front spread, as the centre channel won't be driven the same as the main fronts, how much this will effect you will depend on how loud you play the movies and how good your speakers are etc. You also have the issue of budget, the more money you put into the stereo amp, the less you have for the AVR and therefore the surround sound side will suffer.
I find that the Arcam and Anthem both excel at 2 channel compared to the budget AVR, but even then they wont be the same as a £600 2 channel amp, none that i have heard anyway, but its a very good compromise, they lack features but sound quality is awsum and the ARC setup is second to none, i have had many budget just under £500 like the marantz 5009 and the Denon 2100, and the difference was night and day for me, and a big step up in sound quality for my ears.