My personal favorite non-fence would be Grelka in Riften, because she's both an expert light armor trainer and a merchant who will buy any type of item. Meaning you can buy training, then use her now inflated pool of gold to sell off all your crap. --- One footstep among many is silent. One footstep alone is deafening.
In my game, the trader at Riverwood has over 11,000, I think 11,500.
True but this requires investing via the speech perk tree.
The thieves guild fences (including thieves guild caravan fences) probably have the most money (without using speech perks up to this point (5000 for me ... after completing all the thieves guild misc. quests + the speech perk that adds 1000 gold to each trader ... so probably 4000 for non speech characters)
Except bringing the TG back to its former glory is a f***load of work.
And pretty glitchy too ... i'm still missing my jewelled pitcher (won't spawn properly) and my E.E. trading map (won't activate properly) on the guildmaster shelf ... and i know i already did 125 jobs (because i've already access to the guildmaster safe). I know i't a minor issue ... but it's bugging me for some reason :-( --- Hey i'm not camping ... i'm "tactically waiting" :-D