So, for a 3060 ti, the recommendation is 575w. A good 650-750w unit would be fine. Assuming by your avatar that you are in the US, this is probably the best low cost option right now.
PCPartPicker Part List
Power Supply: Corsair RMx (2018) 650 W 80+ Gold Certified Fully Modular ATX Power Supply ($84.99 @ Amazon)
Total: $84.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2022-03-30 14:32 EDT-0400
You can of course help yourself to finding something more preferable to your own tastes using the following resources, which should help you avoid getting anything undesirable.
Below you will find MY standard list of recommended power supplies and beyond that this thread is intended as a landing place for questions or discussions regarding specific units, platforms or related PSU tech, all of which are all welcome to be discussed here. If it's related to power supplies...
forums.tomshardware.com
PSU Tier List 4.0 rev. 14.8 (outdated) Last Update: 12-07-2021 Legend : Gray - EoL/obsolete and/or otherwise not recommended for purchase. Green - small form-factor (gold and blue colors are disregarded due to scarcity of SFX PSUs) Gold - best units in the tier (includes requirements for blue...
forums.tomshardware.com
As to the AIO, are you looking simply for performance and price or are you wanting an AIO with RGB fans as well? Generally, with few exceptions, fans with RGB require you to take a hit in terms of the fans performance and static pressure. Possibly also bearing quality in a lot of cases.
As for the memory/RAM, I'd personally recommend something from G.Skill. The Ripjaws and Trident Z sticks are pretty hard to beat in terms of quality and the prices are usually better than what's offered by other brands. Anything 3600mhz or higher, or even a lower speed 3200mhz or higher kit with a very low latency should be more than sufficient. Faster memory is nice, but at some point you start trading speed for price and the price simply isn't justified in the grand scheme when you start looking at some of the very high speed kits or the DDR5 kits, HOWEVER, if you are going to give the older system away and not have that memory to reuse with this system, THEN it might be worth considering paying a bit more for DDR5 since that is going to offer you a much longer legged upgrade path later.
And personally, while having been a primarily ASUS and Gigabyte loyalist when it comes to buying my personal motherboards in the past, I've shied away from ASUS in the last few years because I've had multiple customer support issues with them that were clearly warrantable problems and were not ever resolved by ASUS in an acceptable fashion. I also know of a good many others around here including some of the moderators who've had similarly distasteful experiences with ASUS customer support over the course of the last five years so my personal recommendation is that their products are very high quality but IF you should have to deal with them on a CS issue, and there's always a good chance of that with motherboards and graphics cards, it might not go the way you'd like to think it would with a company of that caliber.
Gigabyte on the other hand, I've never had any CS issues with the handful of times I've dealt with them over the past 20-30 years or so.