Definitive Technology Mythos STS crapped out... worth repairing?

Greetings... I dipped my toes into the world of higher end (?) audio eight years ago through a pair of Definitive Technology Mythos STS speakers. These speakers have integrated subwoofers and I loved the bass output and overall sound. But after dropping around $3000 CAD on them (at a time the CAD was at par with USD) the amp boards on both speakers failed after around eight years of relatively light use. Not that I'm bitter or anything...

Def Tech confirmed that replacement amp boards are unavailable. Their local authorized repair centre advised that a component level repair couldn't be carried out. Def Tech customer service has suggested that I send the amp boards to them for diagnosis and potential component level repair for a cool US$600 plus shipping (or a US$80 sucker charge in the event they cannot be repaired).

I am not impressed.

Are these speakers worth repairing under the circumstances? Has speaker technology has improved and/or gone down in price since I bought them (as have televisions, for instance)?

I liked the integrated subwoofers because I have no space for a surround sound system, although listening to music was my primary focus. But I am disappointed that they failed so quickly and equally disappointed with Definitive Technology's laissez faire attitude about the problem.

Any advice (including recommendations for potential replacements if not repair) would be greatly appreciated. I am not sure it's worth investing a further US$600+ to repair the speakers. But I'm also unsure what I might replace them with, budget permitting.

Thanks,

CRex