Basically, I'm reading from moore's. I have read half of the upper limb from moore's and have supplemented it with netter's and a little bit of Gray's. Can I keep doing this?
Well, it's OK with me personally but if you're asking, "will I survive doing this?" - then I dunno. You'll find out on exams, I'm sure.
Seriously, I tried starting out anatomy by reading everything in Moore's. Had I not caught-on to the fact that there was no way I would ever have enough time to read the Moore's material, I would have bombed. Moore's is a good book, but the only time I ever read it was when I truly didn't understand something.
I don't think you can learn gross simply by looking at Netter's. If you can, you certainly never got the "29yo male stabbed in the posterior triangle" type questions that everyone else gets.
We used BRS Gross Anatomy by Chung as our textbook - the fact that Chung was my teacher might have had a little something to do with that. The most recent edition has some really glaring typos - I think Dr. Chung went through the galley proofs way too fast and/or used assistants to proof, but it's still a remarkable book. Every nerve, every muscle - it's all there in very compressed form and the "clinical correlations" will give you enough information to answer the stabbing questions.
You learn to forgive the book's few glaring deficiencies. The illustrations are complete and utter cr*p - I used to cross-reference paragraphs to plates in Netter's. Second, I think Korean is not real big on gender-specific pronouns - Chung tends to say "he" when he means "she" - and he used to get irritated when we would call him down on this - as if it didn't matter. Now, when a test question refers to "he" and the correct answer is "ovarian artery", you get a little upset over this. Finally, in the last edition, there are a few practice questions where the answer is just 100% wrong - they listed the wrong answer letter and Dr. Chung didn't catch it.
Even with all those deficiencies, however, I still think that the book is quite valuable for gross. I used something else for Step 1, since his book is way too detailed for review and gross is low-yield. His practice questions are gold (mind you, I was also taking the tests that he wrote!).