1. We recommend to go in for a separate AVR and speaker setups against a bundled model. A bundled model will prevent you from upgrading individual components later.
2. Invest in a 7.2/5.2.2 AVR even if you are going in for 5.1 speakers so that upgrading the speaker setup later does not result in your AVR going waste.
3. It is highly recommended to buy speakers with 8 ohms impedance so that they can be used with any AVR. Avoid 4 ohm speakers since many of the AVRs can get damaged with speakers that are towards the lower end of the impedance specification limit.
4. Go for speakers that are custom built, hand crafted and individually tuned instead of mass produced ones. This will ensure that all the speakers in your setup are individually tuned and match with each other instead of sample tuning and matching done in consumer grade products.
5. If you are buying 5.1 speaker setup, please ensure that the manufacturer can augment 5.1 setup with additional speakers from the same series or model during upgradation to 7.X / 5.X.X configuration later on.
6. While evaluating AVR power output, it is recommended to look at RMS values and distortion (THD) figure at 8 Ohm load over a power bandwidth of 20 Hz – 20 kHz with 2 channels driven. These days, THD of less than 0.02% is very much possible and will ensure that you get a distortion free sound even at high volume.
7. Please check the launch year of the speakers and AVR so that you don’t buy components that are already End-Of-Life (EOL) or might be EOL soon. This will save you from the hassle of procuring components post sales and matching speakers in future if you decide for upgrade.