https://www.excelsports.com/ritchey-...oaAi5cEALw_wcB
That frameset new in the green color is only $1279 right now, with headset and thruaxles included. Considering that price, $900 for a used frameset isnt great. Its not awful, but its also not great. Just something to consider.
This is a pretty good deal on 105.
https://www.merlincycles.com/en-us/s...et-119887.html
The stock gearing may not be great, but thats a personal thing and each of us is different. It gives you the option of a 10-34 cassette, which is a 1:1 low ratio with the 105 compact crank's gearing. Its only $80-130 to buy a more compact crank that is 46/30, if that is better for you.
https://www.merlincycles.com/en-us/f...sort=price-min
Since I already linked Merlin, here are some thru axle wheels that would work with Shimano drivetrains.
One of the lowest priced wheelsets listed is a Fulcrum 900 DB which is a stock wheelset on some of Canyon's gravel bikes as well as another brand(cant remember). I actually have a rim brake version of the Fulcrum 900 wheels that I bought for $80 last winter and they are fantastic. They are really low in price because of a sale and not because they are poorly made or use junk materials. $177 for Shimano 11sp right now-
https://www.merlincycles.com/en-us/f...0c-212605.html
Here is another solid option for not a ton of money-
https://www.merlincycles.com/en-us/f...0b-212629.html
One more great option in terms of cost and known name brand is this DT Swiss wheelset-
https://www.merlincycles.com/en-us/d...0c-198132.html
Fulcrum is a brand owned by Campagnolo, so it isnt some no-name brand and its very well known and established.
When it comes to wheels, the options are seemingly endless. Like really endless. Prices are $150-1500, spoke count is most anything you want, hubs vary in weight and quality, etc etc.
I will just say that higher cost often means higher quality, but not always. Also, like many things in life, diminishing returns quickly show up. A handbuilt $450 wheelset with Bitex hubs and butted spokes can be, and typically is, just as high quality as a $700 wheelset from a wheel brand.
If you want some quality handbuilt wheels, look at prowheelbuilder.com and build your own or call them and ask for them to spec a wheelset for you. I havent looked in the last year, but even just 1 year ago you could get a really high quality disc wheelset that is handbuilt with proper tension and true, for $450. It was their house brand rim, bitex centerlock hubs, and double butted sapim spokes.
I wouldnt think twice about buying online and bringing your bike to the shop for any work that you cant do at home.
Patience and youtube can explain 97% of a bike build. You would need to just take the bike to the shop for them to look over the build for safety, cut brake hoses to proper length, and adjust anything you cant adjust at home.
Building at home requires a few specific tools to properly tighten components. Really though, almost all of a build is tightening things int he correct way/order.
If a shop looks down on you or isnt willing to install components you bought, then you should take your stuff to a different shop. Simple as that.