Haha, hi and welcome Agwish!

There certainly is a lot to take in. I haven't tried the pram in question (we have a Phil & Ted e3) but I do have kids, and I had a couple of thoughts.

and when we asked our friends they said that their babies prefer to sleep either lying flat or at a very slight incline) ... the DLX is almost at 45 degrees in the furthest position ... obviously once out of the bassinet stage.
My experience has been that once bub is out of the bassinet stage, they can be cranky lying down, when they want to see everything. Mine have ended up reclining partially when at shops and fallen asleep that way. So as bub gets older, you might not end up reclining so far back as often as you think. But you might - humans, especially babies, are a tricky variable.

Which brings me to my next point. Do the best you can choosing a pram, but there's always the option to sell it and buy another one that suits better. I have things my first baby HATED, but my second baby loves and vice versa. That's kids for you. So don't lose any sleep over it, okay?

Congratulations on the pregnancy, and wishing you well with everything. Look forward to seeing you around the forum.