There are a lot of folks that make good BUIS sets - MagPUl, Troy, CMMG, Midwest Industries .... you get the idea.
Of all of them I think the MagPul are the cheapest (cost wise) - they are made of polymer, not the traditional milled aluminum. Aside from cost your next concern would be space - trying to fit them on the rails with your optic. It may just be an issue of putting your scope further up the rail to fit the rear sight. If you do not have enough room one option would be to get a riser/forward cant mount for you optic.
One good feature about a BUIS set up is they are less likely to fail or lose zero once they are set correctly. Another concept is to co-witness them with your optic so even if the optic fails you don't have to monkey around with removing it (unless you have it mounted with a quick detach mount).
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