Dunnersfella: Instead of spending time in the likes of B.Barn or on technology sites... get into a real bike store, ask the opinion of long time cyclists and keep your mind open.
I've ridden and raced (not anymore though) for over 20 years and can tell you the only thing you need to do is ride the bike - then you'll know!
The differences between different brands / styles are really noticeable.
I've built rides up from specs / measurements, but the ride is never spot on until things like stem length, seat rail adjustment, seat height, bar angle are adjusted 'just so'.
Don't even get me started on suspension and brake adjustments... but for commuting, this isn't really needed.
Advice:
Buy a bike with...
Replaceable chainrings.
No idea! But I can ask.
Great wheels. I'd not know what is a great wheel
Top notch comfort... as it doesn't matter how fit you are, if you can't put the power down because you're uncomfortable, you simply CAN'T put the power down!
I guess firm but soft?
Pay attention to the points of contact...
1: Seat (comfortable for the length of time you're looking to ride). Id not know right now!
2: Handlebars - good grips, correct width of the bars, good angle of the bars (plus brake levers) and the right length and rise of the stem. I'd not know!
3: Pedals (clipless / toe straps or flats). Again, I would not know
The point of this weird reply is I don't know what I dont know, plus, if I asked whoever what is a great wheel, etc, I am left with the googled webpage telling me or a salesman, both of whom may be biased, hence my thread here to help somewhat. I gather the Merida that I am looking at is a sound brand, so I hope that the componentry is sound as well. I get the feeling I may get into this cycling lark a bit, so I will learn how to strip and rebuild it, and one day be able to manage these decisions myself, but just at step one at the moment! But certainly many many thanks to the contributors here.