which not too expensive amp for Maggie 1.7 ?

Odyssey Stratos Plus or Extreme.

Innersound ESL-300, supported by the designer, Roger Sanders at Sanders Sound Systems. Sounds great, 600WPC @ 4 ohms.

Used, arount $1600.

Wyred4sound ST-500 are very good amps for "cheap".

Here is a link to the review page.
Wyred4sound reviews

There is an Adcom GFA5500 on Audiogon now.
This amp is a great match.
$600.00. Buy any one with the detachable power cord.

Odyssey Stratos. Maggies crave two things; solid current and damping factor. 45 amps current delivery for the stock Stratos amp will do it, more is better. And the panels need high damping factor to control them. The stock Statos is >500. This mostly controls the bass so it's quick and not mushy. Maggies are very different creatures when it comes to amplification.