Our main runabout has been a Civic since we've had kids. We had a Civic MK8, nothing was comparable in luggage space. Having the fuel tank under front seats meant the rear seats could fold flat, or up out the way, or you could store things underneath them (think plane seats). It even had a huge space under the main boot floor to put even more stuff!
We'd still be using that Civic if it hadn't been written off last year, but it was - and we replaced it with.. another Civic. A MK10, which is slightly bigger overall, and the boot is slightly smaller but it's still huge. I think the only thing bigger is an Octavia. I think the current MK11 Civic is very similar. They're all hybrids now, which whilst I've not driven a Civic with that powertrain, I did have a Jazz with the same system and it was certainly nippy off the line - it just runs out of top end, but then who needs top end over 115mph in the UK anyway.
I'd say you're not mad for considering a Civic, but bonkers for going new - unless there's tax reasons / salary sacrifice / lease through work.