Hey all!

I'm interested in buying a Trek FX bike since I had one a few years ago and loved it. I'm a newbie biker so not at all an expert, looking to go on some short and medium length rides (up to 50km but who knows, maybe more), mainly for fun and fitness. I'm attracted to hybrids because of the more upright position being much more comfortable for me. The option has come up to buy a used Trek FX 7.4 (with disc brakes) that's a couple years old and looks to be in very good condition/hasn't been ridden much. I'm struggling whether I should go with that or buy a new model lower down the series for a similar price.

I'm also between sizes on the Trek sizing chart, 175cm (roughly 82cm inseam if that helps), not sure whether it would be better to get the smaller or larger frame? I'm heading into a bike shop today to try to see what they think so please let me know if there's anything in particular I should be feeling for when trying both sizes. Is it just a matter of which one I feel more comfortable on?

So which would you go for?
What's the current equivalent in the lineup of the FX 7.4?
Are there any significant differences between FX1 and FX2 worth going up for?
Are there other brands that I shouldn't be ignoring in my search? I just have a bit of emotional attachment towards that bike since I previously owned one and have fond memories.

Thanks so much!