There are also some articles out there on making your own rom's. I did that personally as I like to see what is changing/happening. I would agree on RX models being pretty easy if done right to get extra power (Disclaimer any flashing does have a possible brick chance, but so far I have not bricked a single one from flashing).
I think GPU mining is here to stay always will be some coin that remains popular, all we need is asic resistant coin's like some out there. My advice is only invest what you can lose, and also look into buying those part's separate normally when someone sells a pre-built system it's higher then building on your own. With gamer market always being there I view GPU mining as a little "safer" then asics just due to resell.