Hi Junkie, well, as I live in the Province, in Avellaneda, I take issue with your point about Racing, and also I do not agree that it is "safe" to go to Boca on your own. I have been to a few games of Boca, but with local friends and I keep my mouth shut and smile.
But I do agree that the platea is the place to go, and the River v Huracan game would be a very good match to go to, as there would be no hooligan threat, and the match is unlikely to be a sell out - plus it's nearer to Palermo, where the OP is staying.
I am actually Irish, but lived in England for many years, and yes, I follow the EPL exensively. Thankfully, local TV loves the EPL and we get virtually all the big matches live down here. I am a Liverpool Supporter, which has added benefits here, as three Argentine players are presently in the Reds First Team, including he national captain.
As for running, yes, I am a runner, and also training for a target race, the Rosario Marathon in June, so would be happy to point your good lady in the right direction. As I live outside the Capital (albeit only 30 minutes away, with great public transport links) I don't run with the groups of ex pats who live out in Palermo etc... I hash with eth Buenos Aires Hash House Harriers, and if you have arrived by Sunday the 14th, we have the St Patricks Day Run on the Sunday morning, from Accassuso, just a short trip from Palermo by train. I can fill you in nearer your trip - Plus its a good way to meet local runners....
There is a group called Vamos Running Club which has recently started a little running group from Plaza Italia a couple of days a week, but I am afraid I know little of their activities, they are linked to a Spanish Language School - There is a post on here about their plans. Having said that, I am free from the beginning of March, and would be happy to meet up with your wife for a run, and yourself of course for a drink and chat about football.......
All the best......