Here's a pretty good idea as to what foods you can incorporate to provide a bit of variety into the diet.
http://www.bodybuilding.com/fun/stella9.htm
In terms of subway, watch out for hidden calories in various sauces and dressings. I would still prefer to eat a good home cooked meal, but if i was desperate or out of town, then Subway would be an alternate option.
Iv'e never seen a Taco Bell in Australia, so can't help you there.