Re: Which TA to buy?
If you're really considering a TA (rather than an AT - different forum) you're potentially thinking along the right lines for lightness and simplicity. The earlier 600 fits that bill the best (up to 1994 single disk models the lightest), with the 650 apparently slightly harder to work on (e.g., air filter under the tank) but around as light once the exhaust and catylist (not present on the 600) are changed. The current 700 has most of the complexities you mention, so probably not a good bet.
Both main varients of the AT (RD04/RD07) are simple and easy to work on (albeit with the addition of a fuel pump over the 600 or 650 TA), although the RD07 with its slightly more easily accessible air filter and possibility to balance the carbs without removing the tank probably is slightly better for your purposes. Also a few kilos lighter.
They are all good though, so as Kjell says, go for the best you can afford. Age is not a factor, condition is.
"Only one other animal on the planet wears shoes, and only because we grab them by the legs and hammer them on." Christopher McDougall
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