You may still be able to get a Chapuis UGEX at around the 5 mark, if there is any old stock left. Too bad the dollar tanked, as there have been some really good deals on Merkel's in the US in the last year. FAIR has one out, on the Iside 20ga frame, in a small calibers, it may be around the 5 range, it is really light though. There are some non-Cabelas Sabatti's around as well, haven't heard anything about ones sold thru other vendors than Cabelas. Could be they got all the bad ones.
At the time I was searching, Merkel, VC and Krieghoff were all within pennies of each other, Chapuis UGEX and RGEX were cheaper in the smallbores. There are still Blasers and some Merkel's around for just under 10. But a bigbore SXS in anything other than used, or a Merkel or Blaser, won't be under 13 mark now. You want to add any options, add some loot, for some options, add a lot of loot.
For range plinking, an O/U would be adequate, unless you are hung on a SXS, and there are lots around at under the 5 mark.
I forked out for a Krieghoff 3 yrs ago, it has made me happy, it is a different gun to shoot than anything else I have owned, and to load for. Been a learning curve, but, I knew that going in. Points like a shotgun, hits what it is supposed to hit, carries well, it will do what I wanted it to do. It is fun to shoot.