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From a visual point of view the "speed" of a scope is not terrible important. You change the eyepieces to vary the magnification. The most important factor is the light gathering ability ie the aperture of the scope. Stars cope with high magnification as they are point sources. Deep sky needs aperture to turn very dim fuzzies into less dim fuzzies.
I don't agree with the advice to get a refractor. They are heavy and much harder to use than a mak of the same aperture. Not much of a grab and go scope.
Having said that I currently have a 120mm x 600mm achromat that is quite light. This would compare with the 125mm maks but with a much shorter focal length. The mak is nicer for planets as you don't have to use very short focal length eyepieces for the same image size. (same appled for most galaxies or PNs realising that they will be dim fuzzies). On widefield, the little refractor is probably better.
Good luck
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