crops per plant?

Some crops are easier to store (toms, peas beans brussels can be frozen if you've got a glut) pumpkin will store for a while, but courgettes and cucumbers need to be eaten fresh (although you can pickle)
Suggestion; 2 courgette plants (they grow big and take up room)
2/3 cucumbers (in big pots)
about 6 feet of spinach (try perpetual....it keeps going through the Winter)
6 Brussels (get hardy ones that will stand through Winter)
about 12 feet of dwarf beans and/or 6 runners
2 pumpkins depending on size
lots of tomatoes! (6+ plants)
I grow sugarsnap peas because I haven't got the room for the others. Just grow loads!!!!
What about carrots????In my opinion they're the best garden crop as long as you net against the dreaded carrot fly.
There's also time to sow leeks........and don't forget salad leaves!
Does anyone think that's too much/little? I grow for 5 and never get it right!!!!!

I agree with most of what Viettaclark suggests but remember to grow extra seedlings. I eventually grew 3 courgette plants last year but sowed 6 and had to replace two that got munched by slugs. Cucumber are notorious for just wanting to die! Sow at least twice what you plan on eventually growing and keep them going until they are well established. Last year I grew around 30 pumpkin and planted out 20 of them. They keep well but take a lot of space so you might need to cut down if you are short of space.

Ps - I think you are right about never having too many strawberries. I have planted another bed of them this year because last year was my first year and only gave me a few a day. Not enough for jam or pigging out on big bowls of them with cream.