If you're happy with Bose, you should stay with them.
The question is, has he listened to all the other speaker systems?
If Best Buy is convenient, then compare the Bose to everything else there first - Klipsch, Definitive Technology, etc.
I also have a Bose system, which is now in my 6 yr old daughter's room - nice & cute.
I've also had a NHT system (SuperZero + SW2P = $1,300).
Although the NHT system is less expensive than the BOSE, the NHT sounds A LOT better than the BOSE in my opinion.
Sure, if after listening to everything else and the Bose still sounds the best, then get the Bose.