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In my personal opinion the best options with your current requirements would be
The FrameWork model 13 with i7-1370P, it includes bootguard, memory encryption, has TPM 2.0 and hits an HSI-4 rating from LVFS. The only downside is the firmware is fully proprietary.
If some openness to the firmware is an absolute must for you then my second recommendation would the the V54 from novacustom, once the bootguard support update is released it will be a corebooted laptop that will have an HSI-3 rating, the downside here is that it lacks memory encryption. One other thing to note about this laptop is the Openness score from dasharo, when you view the benefits of coreboot by percentage of open source code to binary blobs the benefit of having an open source bios shrinks, as only around 30% of the bios is actually open source code.
Side note, Dell is also a great option as discussed earlier in this thread.