Just buy the first gun you find! Any price!
No, just kidding.
I'm disappointed for you that you just happened to choose this moment to get into firearms, the worst moment in recent history to buy, uh, ANYTHING gun-related. In my world, it just happened that a couple of weeks before all of this blew up, I had just bought my last 2 must-have guns. I'm feeling pretty set.
On a serious note about your question, you really ought to have in mind even 5 guns that you would accept and then go looking for all of those. When things level out a bit, you can always sell it and buy what you want later. I don't still own any of my first 5 or 6 guns.
.45acp, .40 S&W, 9mm, .38 Spl, .380 acp, 22lr
12 gauge, .223/5.56x45mm, 30-30 Winchester
2 Chron. 7:14 Christians must seek His face