There are three rifles I passed by that I've always regretted. The first was a near-pristine 1903A3 that I passed on because I was saving the money for something else. The second was a Kar.98k that was in about 65% on the wood, 60% on the metal but had a spotless bore. I was looking for one that was in a bit better condition, silly me. The last was a never issued Czech VZ-24, arguably the best of the Mausers. That one I simply had to walk away from because I didn't have quite enough cash on me. I can't begin to count the number of US M1917 rifles, SMLE's, Mosin-Nagants and others I've walked right by without ever looking twice at them.
I have had the pleasure of owning some magnificent rifles over the years. M-1 Garand, M-1 Carbine, M-1A, Schmidt-Rubin, SMLE (finally did get one), Colt Match H-BAR to name a few. I've also owned some real stinkers, such as the Norinco SKS that we picked up at a gun show for $59. Most inaccurate rifle I ever had the displeasure to shoot. Also liked to rust as soon as you turned your back on it, despite just having been cleaned and never using corrosive ammo!
That's all in the past now. All I have are a couple of .22 rifles - and no ammo to shoot. *sigh*