Although you haven't given much indication as to what level textbook you're looking for (you said "undergrad"), I'm going to assume your prerequisites in physics are rather minimal.
If so, I suggest Kleppner's Introduction to Mechanics. Despite its title, the book is rarely used as a first course in Mechanics and is instead implemented in honors physics sequences at univeristies. But it is indeed great for self study (as I can attest) because many of its problems have online solutions. And its problems...Wow. They really help in developing physics problem solving skill and intuition.
Another alternative, which is gaining popularity at top universities, is Morin's Introduction to Classical Mechanics. It seems to have been written in the same spirit as Kleppner's book and covers the same topics (plus more!) but feels more "modern" if you can say that about any classical physics text. But for an introduction, I still prefer Kleppner for some reason. Morin's book does have its highpoints, however, including its sections on Lagrangian Mechanics and Noether's Theorem, Hamiltonian Mechanics (on the book website) and Angular Momentum in three-dimensions which are all treated at a high level of mathematics. Lagrangian Mechanics is an alternate formalism of Mechanics (distinct from Newtonian Mechanics) and is important in advanced physics with Noether's Theorem especially important in particle physics. Hamiltonian Mechanics is also an alternate formulation of Mechanics which is used in the development of Quantum theory. Last but not least, Angular momentum in three dimensions is just really interesting!
Oh! I forgot the most important aspect of Morin's book: Its problems. In the introduction, he claimed to have compiled close to 600 problems and about 250 of these problems have solutions at the end of the chapter. This facet probably makes Morin's book even better for self study than Kleppner's, but, as I mentioned before, you can find many of Kleppner's solutions online.
Here are the amazon links to the books
https://www.amazon.com/dp/0070350485/?tag=pfamazon01-20
https://www.amazon.com/dp/0521876222/?tag=pfamazon01-20
and if you want to look at some chapters before you purchase it, here's a sample of Morin's book
http://www.people.fas.harvard.edu/~djmorin/book.html