I have personally installed condensing boilers since 1987. The high efficiency condensing boilers made today all modulate flame, condense AND include weather sensitive controls (outdoor reset). Most are quite reliable provided
they are installed by a qualified (read experienced) contractor. A factory training certificate provides evidence of intent, if not competence.
I would look to the local market for support and professional training. The cost of the boiler is irrelevant since you can't use it until it is in working order. Warranty unfortunately doesn't reflect the finished product.
First the size of the boiler matters, second the proper fit to application and most important the guy who will install it.
Furthermore, the Munchkin boiler was an HTP product, but the Elite is the top of that line, featuring upgrade HX and controls. It, like the Alpine condensing boiler use the Giannoni SS HX and are water-tube boilers in contrast to the Belgian made SS water-tube HX made for the good folks at Triangle tube. All are good boilers depending on the system they are applied to and the expertise of the installer.