It is, of course, up to you. I'm about half-way through my Agatha Christie collection, and I think I got them back in 2009 or even 2008.
Having just got the Lord Peter Wimseys for about $1 each in a splendid offer/Kobo discount combination, I do regret the $6 or more each I spent on two of them a while back.
With 'classic' series, it's a question of how quickly you want to read them. I suspect that, unless you gorge on the omnibus, a better offer will appear before you've finished reading them.
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