you totally got this!
as for a tanks go.. I have had red sea 750 XL ,red sea 650P, WB 2420, WB 16, fiji cube 18.5 pen. res sea 300XL, SCA 90, 40brs 20L...wow I have had alot of tanks for the years.
anyway my current "big" tank is the IM 200 EXT peninsula love it, I think it the best bang for your buck out there and it very well made. the APS stand is really nice I give it a 9.5 out of 10 and the tank it self is 10/10
there sump is pretty nice too. not ideal for peninsula tanks but it looks amazing.
I got the tank before they offered complete plumbing. but I was ok with that as i did my own think so no pipes getting in my way.
I am just cycling the tank as we speak. all tho i had it in the house for a year. was working on the RS 300XL
if you have space in your home I would strongly consider the peninsula version of that tank. it makes the perfect room divider
a body of mine like it so much he got the 200 int. pen. even tho he will run it one side on the wall.
so you're right on the money for tank selection IMHO.
like other have said just make sure the flooring can support the weight of the tank.
get some help alot of it moving it in. the tank weights 400# or so. cant quite remember but i know it's heavy.
you totally got this. go slow get the tank and gear. get it cycled then move everthing from the 75 over. you will find have a sump so nice. the aquarium will be a major feature in your home.
if you have any questions feel free to ask.