Hello Rut and welcome to the fray! Please don't listen to those MG guys, they are woefully biased and their Triumph advice tends to be somewhat, umm, flawed (with the <u>possible</u> exception of Doc, above /bcforum/images/%%GRAEMLIN_URL%%/crazyeyes.gif).
The answer to your question essentially depends on two key points: 1) your budget; 2) your mechanical skill/ability.
Number 1, BUDGET: Unless you're a professional auto body technician, purchase a car that has little or no rust. Rust is our enemy because it's relatively difficult and expensive to restore.
And, purchase a car with decent paint job. A car with good paint is a real money-saver.
Number 2, mechanical skill: These cars are surprising easy to maintain and restore, with lots of aftermarket support. However, if you don't posess the skill to work work on the car you'll probably have to pay someone else to do it. This can get expensive and cause you to be "upside down", financially, with the car (i.e., your cost to restore exceeds the retail value of the car). Not an optimal position.
Finally, the essence of my rhetorical outburst: be extremely patient in your search, then purchase the best possible example of the car that your budget will allow.
In some cases, it may be prudent to stretch your budget if necessary, for a really good example. The general idea is to purchase a car in which some other poor soul has "invested" way too much and is forced to sell at a loss (sad, but true /bcforum/images/%%GRAEMLIN_URL%%/cryin.gif). Such cars are out there and waiting for the patient, informed buyer.
Restoring these cars is a wonderful experience, but I think driving them is better! If you can buy a driveable example, you'll be able to restore AND drive, the best of both worlds.
Please let us know how it goes, and good luck!!! /bcforum/images/%%GRAEMLIN_URL%%/thumbsup.gif