FanFiltration said:

I've just started reading Uncanny X-Men. I've wanted to for years, and now the time has come. I just got myself the Marvel Masterworks collection, so I'm starting with the Giant-Size X-Men Second Genesis Issue (#1 from 1975).

While everything you said was technically correct, it is a little confusing. Giant Size X-Men #1 is a great place to start with Giant Size X-Men as it is the first of two issues of Giant Size X-Men (unless you count #3-#4 that came out 30 years later). What you're really reading is (Uncanny) X-Men starting in issue 94, but not before kicking it off with Giant Size X-Men #1.

Which is a great place to jump into X-Men. I said this on the first page somewhere, but 100 is about where the Phoenix stuff starts and it stays, in my opinion, really good for a couple of years through that section. Hopefully you stay on through Inferno.

How many MMasterworks did you get? They can be pretty pricey, and I can't remember how many collections they did/how man y issues they reprinted.