I just found out my weekend aeration has gone wrong, the machine must have cut my landscape lighting wire somewhere, as the whole backyard has no light now. Anyone has similar experience here? There are 20+ lights all over my backyard and I have no clue how can I locate the broken wire, anything I can do here?

I'm planning out a 800 sq-ft room that will have at least 8 12V MR16 LED lamps (10w each). I'm looking to put 2 of them on one dimmer and the other 6 on another. I've done this before in my house using magnetic transformers and i guess i'll need a 75W and a 40W (for expansion) to power those 2 lighting groups. But man those things are big and expensive and it pains me to pay $100 for the 40W transformer to power 2 lights! I always thought that i needed magnetic transformers because the runs are more than a few feet. Looking at one of the WAC electronic transformers the specs show runs on 12g wire well over 20 feet. I could also get the mounting based with an integral transformer and run line 120v to each spotlight. At the end of the day this is probably a 10% difference in project cost so its more a question of - does it matter? Is there any benefit or difference between running 120V to each fixture, a remote electronic transformer, or a remote magnetic transformer?