Help with buying new Amp!

Hey Guys, Alex from Argentina.
Im a big big fan of music and I enjoy listening to music every weekend for hours, and its time to improve to a better and definitive amp!! (i have sony homethater type that sucks). I dont need de amp for TV.
I have a pair of techincs SB lx70 speakers.
Here are my options:

1. AKAI as-970
2. Sansui 7070
3. Grundig R45 made in germany
4. Technics sa dx-950
5. Denon Avr 2600g
6. Marantz Sr 4300

Please Help. All have same price but The Sansui is 10% cheaper, and the Marantz 20% cheaper.

Thank you in adavance for your wisdom and help!!