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Tri-X would be as good a choice as any. You might prefer the availability of Ilford HP5+.
If cost is a concern, there is a fair amount of FOMA film around - both branded that way and re-branded with names like Arista.
Your preference for grain is an argument against using slower than ISO 400 emulsions or any of the Kodak T-Max or Ilford Delta films, so my preference for a pair of films - T-Max 100 and T-Max 400 - probably won't suit you.
Most of the relatively easily obtained films can be used in ways to make the results come out quite similarly. For that reason, it makes sense to give extra weight to criteria like availability and cost. In addition, in light of where you live, you may want to consider the availability of data regarding slightly higher temperature (24C) processing.
Most of the commonly available and used darkroom chemicals are easy to handle and not particularly toxic at working strength. With one possible exception, you wouldn't be safe drinking them and you wouldn't want to bathe in them, but taking reasonable care should prevent any problems. Most can be disposed of in a septic system, if reasonably diluted, although I would be cautious about doing that with silver laden spent fixer, as the silver is a bactericide.
In your environment, you might actually want to pay closer attention to procedures that minimize water use.
The Ascorbic acid based developers like Kodak X-Tol and some competitors probably have the lowest environmental impact among film developers, but in essence, unless your volumes are exceptionally high - think commercial labs - the environmental impact of all the normally encountered options is quite light, if you handle things prudently. Even the most problematic solution - silver laden spent fixer - makes decent fertilizer! But if you don't have an appropriate garden for that, there are other ways to deal with it.
Given the temperatures you encounter, and the fact you will be using 120 film with backing paper, you may want to pay extra attention to the relative susceptibility of backing paper equipped film to harsh conditions. Storing film in some sort of climate controlled conditions and using relatively "fresh" and developing it promptly may be extra important for you if you wish to avoid the problems with film and backing paper interactions - "wrapper offset" and related effects - that seem more common now.
I believe that the Kodak films use the most modern version of backing paper, and that may currently be the most heat resistant, but I've seen nothing that specifically addresses that issue.
Matt since the OP is in the USA SW....(especially w tariffs) i'd expect Tri-X would have a more reliable supply and lower cost than HP5 ?
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Setting up a darkroom is a large leap.
To be clear - are you planning on using Rodinal to process your paper after exposing it with the enlarger? That will work, but Rodinal is a lot more expensive to use as a paper developer than something like Dektol or even Ilford MG developer, last time I did the math. IMHO, it's worth choosing a developer for your TriX (Rodinal is a popular choice, though you should be aware that it will produce pretty gritty photos with 35mm TriX), and a different developer for your paper.
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