I read Day Of The Triffids years ago and from what I remember, enjoyed it. The Kraken Wakes sounds pretty good! How's the writing style? Not too cheesy? I really can't remember his style at all.
I really rate John Wyndham from that era of sci fi writing. I wouldn't say cheesy at all. I'd also recommend The Black Cloud by Fred Hoyle if Wyndham is working for you.
It's been a while but I used to read a lot of Wyndham - not cheesy at all. Quite pessimistic perhaps? Not the word I want to use but I'm having trouble articulating...
Have you ever read any John Wyndham? The Kraken Wakes is a good place to start I'd say.