Hi Diana,
The other option from GME TX3540 (or TX3340), is the Icom IC440N - which has the advantage of having speaker and mic in the handset. So no need for external speaker.
If I were to install an external speaker for the GMEs, I would use the space where the centre speaker is usually located - as I don't have a high-line stereo.
Regarding the handset, I am about to order one of these:
Land Rover Disco 4 Heavy Duty Mount | Land Rover | Dashmount Brackets | Dashmount - Dashmount
Freight is the killer on these - maybe a group purchase is in order? 
 
Cheers,
Rob
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