Cibola can be deep but if you plan on swapping coils and detecting in different soil conditions, you may want a unit with adjustable ground balance... I do. My current favorite Tesoro is the Outlaw. I have most of the current Tesoro land models and several older, discontinued ones. Outlaw is pretty sweet and quite versatile. Vaquero is a little deeper and also very capable, but a bit less of a coinshooter, and more of a relic unit; still great for coins, just not as nice as Outlaw, particularly in trashy areas. Cibola is very similar to Vaquero and great in mild soil, but not as good in heavily mineralized spots (no GB).
The current Silver μMAX is the one I don't have (though I have both the Silver Sabre and Cutlass μMAX). Silver has a fixed ground balance which isn't going to let you optimize GB for different soil conditions or coil swaps, but I think it should be a very nice coinshooter in mild soil.
For a tight budget, beginner's detector, (I'd) go with the 8" Compadre. If you can budget a bit more $, (I'd) get the single coil Outlaw. Whichever Tesoro you choose will be fun to learn, but some are better in certain applications than others.
^_^