Guys

I need some advice.....

I have ordered an Octavia 1.8 Tsi L&K which arrives in 3ish weeks. I was going to chop in the Signum, but our other car is and Astra G on a 52 plate. I'm wondering if I am doing the right thing? I figure the 1.6 petrol Astra will be more reliable and cheaper to fix than the now out of warranty 1.9 Cdti Signum?

Argghhhhhhhh

What should I do?
Andy