I attended the Del Mar Electronics show this week. There was an Analog Devices/ Linear Tech booth. I asked about LTspice and the convergence of AD parts with LTC parts. I was informed this was in the works. This convergence should add a large amount of component coverage in LT Spice which will make this free tool just the more valuableFourth.
Just keep in mind that you will likely need to create a lot of models yourself, or at the very least import them from third-party sources. By default LTSpice mostly only contains Linear Technology components and a few other standard parts. But chances are you'll need to import your own models for a lot of circuits.