I only know enough to be dangerous. I didn't need mil-spec for the mobile though I did have the Yaesu 8900 for a short time and it was pretty darn durable. I switched to an Icom 7000 for the wider band range and other nifty features.
On the HT, you will hear a lot about the Yaesu vx series (vx-6 and vx-7 especially). Super tough radios with dual vfo and tons of memory and features for comparatively little money. You'd have to spend a lot more to get the same features from Icom (but you'd also get D-star if you wanted that). I went with the Yaesu vx-7.
As for programming, if you go with the manufacturer cables, it seems you'll need different cables even if both the mobile and HT are the same brand - I'[m not sure on this as I'm just now researching, but it seems to be the case. But if you go with a third party setup, you'll be able to program a wider range of radios - both HT and mobile (and for less money).
As for having a speaker loud enough to hear in a buggy, if you're referring to the mobile you'll likely be mounting it remotely anyway and so you'll need an external remote speaker. Once you go that route, you can get something plenty loud (and clear) and mount it right next to your ear if you like, so the internal speaker won't matter.
If you're talking about the HT, you'll just have to hold it to your ear (though you could also hook up an external mic and speaker, but that costs more).
Good luck!
On the HT, you will hear a lot about the Yaesu vx series (vx-6 and vx-7 especially). Super tough radios with dual vfo and tons of memory and features for comparatively little money. You'd have to spend a lot more to get the same features from Icom (but you'd also get D-star if you wanted that). I went with the Yaesu vx-7.
As for programming, if you go with the manufacturer cables, it seems you'll need different cables even if both the mobile and HT are the same brand - I'[m not sure on this as I'm just now researching, but it seems to be the case. But if you go with a third party setup, you'll be able to program a wider range of radios - both HT and mobile (and for less money).
As for having a speaker loud enough to hear in a buggy, if you're referring to the mobile you'll likely be mounting it remotely anyway and so you'll need an external remote speaker. Once you go that route, you can get something plenty loud (and clear) and mount it right next to your ear if you like, so the internal speaker won't matter.
If you're talking about the HT, you'll just have to hold it to your ear (though you could also hook up an external mic and speaker, but that costs more).
Good luck!