Is this a good deal? 58g Oceanic reef + extras

[alkatraz]

Hi, I'm new and hoping I'm posting this in the right forum. Looking at marine + reef systems and found the deal below. Hoping I could leverage your combined experience and get some opinions on this?

I'm moving away so I need to part with my saltwater setup. Basically everything you need to set up a serious reef aquarium. I will sell everything in two packages ($450 takes everything).

58 gallon reef system - Comes fully plumbed and is ready to be set up -$350
58g Oceanic Reef Ready tank w/custom stand
20g sump
Euro reef RS80 skimmer
Tunze silence 1073.020 return pump
Eheim 250w heater
Battery backup (a must have during power outages)

Saltwater supplies - Everything you need to start making saltwater - $200
25 gpd RO system
Vertex Refractometer
Millwaukee TDS meter
Salifert Alkalinity and Calcium test kits
TLF 150 media reactor
Seachem Reefsalt (80% full)
Eheim 100w heater
Misc Maxijet pumps, algea scrapper, Tom's aqualifter

and

lumenmax 3 250w mh pendant w/ ballast and ushio 20k bulb, i have the kit to suspend it from the ceiling. I could let that go an extra $200.

All that for $650.. is this a good deal?

If I wanted to upgrade the tank to a rimless later, how much could I sell this tank for on its own?

If I wanted to get a larger tank later like a 90g or 120g would the 20g sump & all the other "stuff" support that size or would I need to replace it all?

Thanks!!