Hi Archery Wife,
Working within your budget.
If you want to stay with DSLR's, I'd recommend the 90D. 32.5MP, 45 AF points, an ISO range double what you have now and 10fps. If you compare this to the T7, 24MP, 9 AF points, ISO 12,800, 3fps.
It would be a dramatic upgrade for you. You'd have to buy Canon Refurbished or used to stay within your price point. I didn't see refurbs in stock. Don't be afraid of buying refurb from Canon. These products come with the same 1yr warranty as new. New the 90D is about $1200.
Your current lenses. the 18~55 isn't a bad lens. It offers modest performance and is good for wider angles and casual everyday shooting. The 75~300 II is a different story. It lacks IS and is not one of Canon best endeavors from a performance, speed or IQ standpoint. It takes pictures and is very basic, but not much else. You will be able to use both of your existing lenses with a 90D seamlessly.
Let's just pretend for a moment you are just starting out, or have been away from photography for a while. You want Canon's latest technology and have a slightly larger budget. In this case, an R series body is a better choice for the following reasons. Night a day difference from a performance standpoint. A mirrorless body can focus faster, track subjects better and perform better under a variety (even adverse) shooting conditions, low light etc. Don't get me wrong. The 90D is an extremely capable camera. However, mirroless has ecliped DSLR technolgy.
Steve's suggestion above (R7) would definitely be a great choice for someone looking to "step up" and enter the mirrorless world. With it however, come some additional considerations. You can adapt EF/EF-S lenses to a R series mirrorless body. People who've done this will attest their EF series lenses perform better on a mirrorless body over a DSLR. Brand new, the R7 is $1499. Its on sale right now for $1399. The lens adapter EF/EF-S to EOS R is $100.
The R7 has a kit option body and RF-S 18~150mm for about $1700. Like Steve, this would be my recommendation, but is not within your stated budget. Take a look at this comparison.
Canon 90D vs Canon R7 Detailed Comparison (cameradecision.com)
Coming from where you are now, there are (example) 10 reasons why the 90D would be a great upgrade for you, and 10 more why the R7 would be fantastic. If you decided on the R7, I would recommend the kit option, as it would address the majority of your needs with a good path forward. Current body, current lens options, better long term investment overall. etc.
The 90D would be a steppingstone. It will address many of your current wants, but at some point again, you will likely decide you want a mirrorless body. So you are at a cross roads of deciding do it once, or do it twice. This is what we cannot answer for you.
Think about it. Do a little reading and let us know if you have any questions.
~Rick
Bay Area - CA
~R5 C (1.0.7.1) ~RF Trinity, ~RF 100 Macro, ~RF 100~400, ~RF 100~500, ~RF 200-800 +RF 1.4x TC, BG-R10, 430EX III-RT ~DxO PhotoLab Elite ~DaVinci Resolve ~ImageClass MF644Cdw/MF656Cdw ~Pixel 8 ~CarePaks Are Worth It
