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I'm partial to vortex, i have a crossfire 2, and a sparc ar and very happy with both, have also used a bushnell trs25 (brother has 2 of them) and wouldn't hesitate with one of those either.
I haven't tried the sig romeo myself, but see it recomended often.
I opted for a Vortex Sparc2 because of the 2MOA dot, on sale for under $200 and the Lifetime warranty.
Turns out I had forgotten how poorly my eyes see red dots so I mounted a Primary Arms SLX micro Prism with ACCS Cyclops reticle and haven't looked back.....
Im running a Holoson HE508T-RD on my 460 s&w, Its rmr footprint so easy to find plates/risers
Ive had it two years now and its always returned to zero and always held zero with that much recoil. I cant say enough good things about it.
As well the solar on top is a huge bonus.
I Also own 2 Trijicons they are cool just, on the pricey side.