Sethwas has a great list here:
I did 1), 2a) and 5) so far.
I agree that the Amp has to go at some point, and some equalization control would be a give help, so 4a) would be it for me.
The reason I did the subs first is the cost of a decent amp is well over $1000CDN while subs were less than $300. The base is pretty good with the earthquakes, but the stock equalization tuning in the HIFI system is terrible once you have installed components and better subs.
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