For me, cheap was a waste of money, and I w/h/b better off going straight to what I finally settled on - Leupold 12-40x60 "Gold Ring". Picked it up used on dBay for about $600.
In the matches I shoot I frequently use other shooters' S-scopes, everything from the worst to the very best made. NONE of them can be counted on to see even 30-cal holes on paper at 600 yards. You are much better off spending your money on a target camera or an electronic target.
Even some expensive S-scopes have very minimal eye-relief, which makes them difficult if not impossible to look through with your shooting glasses on. The first time I looked thru one of the 12-40x60 Leupolds I fell in love, mainly due to generous eye-relief but also with the very clear, bright picture. I look thru $1,200 - 1,500 scopes all the time that no more clear, and that are dark and hard to look thru compared to the little Leupy.
You need angled if you want to shoot your rifle prone or on a bench and then rotate your head and look thru a S-scope. I never do that because if I can't see the hole with the NF on my rifle I'm not going to be able to see it with any S-scope.
What I need a S-scope for is spotting for others at LR -- either watching his bullets fly downrange to help them get on target, watching where their bullet hits on the steel, or seeing what markers the guy in the pit put on their target. I am either standing or sitting at a bench, so my straight Leupy works great. For sitting at a bench and spotting, which I do a lot of, I prefer straight to angled. In none of those things do I need an expensive spotting scope.
If I was bird-watching I'd buy a Swaro in a heartbeat. They are incredible to look thru. But for the spotting I do, I just don't need it. I wouldn't be able to see holes at even 500 yards half the time anyway.
But I do want to be able to see holes at 300 yards on a nice cool day, and the Leupy works fine for that.