Whilst it's all well to compare the price of 2 watt Shinkoh's to AN, have you actually looked at the values available and were the ones for 8 Pounds usable in any circuits you want to use them in. The remaining stock are all values rarely used hence the quantity available, all the commonly used values show zero stock. Shinkoh haven't been manufactured for at least 10 years now if not longer.
As for run in time on AN resistors, they don't even begin to sound the way they should until at least 80 hours run time. The system I used at the recent show in Sydney had at least 60 of the silver resistors in circuit both in the amp and cd player and the minimum run time was 150 hours for those.