Politically Argentina is getting every year closer to Chavez' Venezuela, which is helping Argentina even financially (by buying its bonds for example or by shipping underpriced oil). Could this mean that Venezuela could partly finance a batch of SU30s for Argentina after receiving its own ?While not being an expert in this area, I'll make a few comments.
I guess on the face of it having an aircraft like the SU30 in service would provide some real benefits to the Argentinean Air Force, range, performance, etc.
However everything I read says that the Argentinean Air Force is a professional air arm and will have to know what it wants, and how it wants to achieve it with the resources available.
Bearing this in mind, lets not forget that the while the SU30 has a good reputation while in the air there are also lots of evidence to suggest that the effort to keep it operation is much more than is required with the equivalent western aircraft.
Also the report on the M2000s is for second hand aircraft, which will always be cheaper than new. Also the Argentineans have a history with Mirage.
So bearing those two points in mind (and if the purchase of the M2000s is true), the Air Force will be getting a reliable aircraft from a reliable supplier that will cost less to run than SU30s, which will be very important in an Air Force where funding is tight.
Some thoughts.
Having said that I am sure that the news tomorrow carry the story of the SU30 going to Argintina
I don't think Chavez own military will take it well that he is dishing out cash for other countries military. There is a lot of poor people in the rural parts of Venezuela where the excess petro dollars can be better spend.
Argentina & Chile train to defend - or attack across - their mutual border. Their current generals all remember being mobilised ready to fight each other, when they were junior officers.
Sorry, my meaning was probably lost re-reading.
With all the money Chavez has he could create a regional infrastructure centre for maintenance of Sukhois in Venezuela. Peru and Mexico (if its navy confirms the SU30 purchase) could profit from that centre. Argentina would just have to join.
Yeah, that makes sense.
the SU27 deals dead
Ok thanks that's clear enough. Besides I agree that a long range maritime patroller such as a P3C would be much more useful to cover the oil installations than a SU27...
I am very doubtful about the feasibility of the upgrade to -5 standard in Argentina itself. Dassault will want to keep it for itself and the French government will only provide second hand jets for cut down prices if its industry gets contracts in exchange (at least an upgrade if not an outright buy)
Well now, hi to all here... I've heard somwhere in the Punta Alta Naval Base that Argentina maybe whants to buy some JF-17 (around 40) and a couple of J-10 wings (about 10 planes). This makes some sense despite the fact that China owns the biggest iron mines complex in South America, located in Sierra Grande (41°36′41″ S 65°21′27″ W)... The J-10 as a delta fighter has some resemblance to flight conditions to the Mirage, and like an IAI Lavi development (aka F-16), it will more likely to outrun the 'new' Chilean planes...
to the French Exocet used by the Argentinian Navy in their AMD Super Etendard). Even with JF-17 and JH-7 having almost the same range than the Mirage (it also has not in-flight refuelling), they could be modiffied to give it that capacity... 
The Mirage 2000s can potentially be quite useful. After all, of the countries that are looking to purchase them, how many would be willing to go up against a European or North American power? Not many. Instead, the aircraft that the Mirage 2000s would be fighting most likely would be aircraft or designs that pre-date the Mirage. For example, with the Argentinian purchase, the most likely opponents (assuming the Falkland Islands row isn't started again...) would be the neighboring countries of Chile, Paraguay, Uruguay, Bolivia and Brazil. None of these countries are fielding any of the advanced fighters that are just entering service either. Keep in mind the local/regional context of a military purchase, because that is what drives it.