your equating quality to price there isn't always a direct comparison between the two.
For example
AV 1 £250
AV 2 £500
av2 is identical to av1 but has extra functions that dont affect the quality but is twice the price.
Under your scoring scheme av1 would be rejected 'cos it was too cheap.
there isn't always but usually there is. obviously there are exceptions to this with companies such as BOSE, Beats, Apple, etc. Who market themselves towards those that don't have a clue.
If you go into richer sounds and say AV1 is £250 and AV2 is £450 you can pretty much guarantee AV2 will be better. it won't just have extra features but better components.
I know better than most that spending more doesn't mean better. I've even been ridiculed by people when I mention that the most someone should ever spend on a pair of headphones is £150-£300, because some on here have spend up to a thousand. After that price point your paying up to 10 times as much for sometimes no improvement what so ever or slight differences or a different type of sound.
A quality DAC/AMP for a pair of headphones however can run from £120 for a cheap chinese brand to £500 for a well known american or european name.
Like I said before that is a DAC/AMP for a pair of headphones which has to deal with a fraction of what an AVR does.
I have also posted roughly what the brand new costs are for a top end AVR, a mid range AVR and anything below that would be classified as budget.
People may very well say my £200 amp sounds decent, but have they ever listened to anything better?
I personally own about £2000-£3000 worth of headphones. So you could say I am experienced in terms of real audio quality. I have also tested multiple DAC-AMP's priced from £5 all the way up to £800. Anything below £50 just doesn't sound that good tbh there is a very noticeable difference jumping up. What's the best price point for a headphone dac/amp is probably £200, you could get a schiit modi/vali combo for around £200 which would give much more expensive setups a run for their money.
Sound will only sound as good as the weakest link in the chain.
Media - Source - DAC - AMP - Speakers/Headphones
So after all my extensive testing of headphones and DAC/AMP's. I just don't see how you could get a brand new even semi-decent AVR for £200. Second hand absolutely. FYI the AVR I bought is a Yamaha 677, for £170 posted. The original owner bought it brand new from richer sounds 4 months ago for £250 in a clearance sale.
So you maybe could get a semi-decent AVR for £200 in a clearance sale but not at regular RRP but that would be the only exception.
So for £200 I would strongly suggest buying second hand. AVR's have to deal with so many different things I don't see how 200 notes will get him anything remotely as good as the second hand market will.