Great Argentine Bands

My favorites-
in no particular order:

Juana Molina
Gaby Kerpel
Axel Kreiger
Ulises Conti
Entre Rios
Gotan Project
Hugo Diaz
Isla de Los Estados
Mi Daras Mil Hijos
Orquestra Tipicia Fernadez Fierro
Tango Crash
Supervielle's Bajofondo Cd's
and many of the Zizek collective

Cant say that the Bersuit really rang my bell, but then I am not a big fan of that style of commercial rock in any language.
Soda Stereo, Las Pelotas, Los Divididos, Cuentos Borgeanos, Virus, Los Auténticos Decadentes, Los Fabulosos Cadillacs, Sumo, Andrés Calamaro, Ataque 77, Catupecu Machu, Los Estelares, Ella es tan Cargosa, Los Piojos
Im a big fan of Argentine bands and i have to say that the underground has some interesting bands you should check out:

El Mato a Un Policia Motorizado
Victoria Mil
Jaime Sin Tierra,
Rosario Blefari
Los Alamos
Lisandro Aristimuno
Francisco Bochaton
Alfonso El Pintor
Mujercitas Terror

uffff i can go on and on.....
I could name a lot of bands but ill keep it simple.

Of the older stuff:

Spinetta in all his form. One if not THE most mature rock musician of the country. hippy stuff so be warned :D.

Spinetta - Durazno Sangrando (1975)

Patricio Rey y sus Redonditos de Ricota (aka los Redondos). Mostly straigthtfoward rock and roll, with good riffs, come very criptic yet great lyrics and just pure awesomness.

Los redondos - La bestia pop (1986)

Of the new stuff:

Los Natas. Great stonerrock band. Their first two albums are in english.

Los natas - El cono del encono

Pez. Ecclectic band that mixes psicodelic rock, folk and even some tango (esque) feel.

Pez - Maldicion
We live in the NW of Argentina and have a restaurant - any one recommend a live band worth hiring?
You have quite a few there... my personal favorite: Las Pastillas del Abuelo.

Buena suerte!
Rata Blanca are hilarious- I guess they have never seen the movie "Spinal Tap"?

You know what they say, those who werent alive in 1974 are doomed to repeat it again and again.

Luckily, I lived thru hair bands the first time.
And once was certainly enough for me.