If you're hell bent on buying a new reg set you'll not go wrong with either AL or SP. the MK17 can have a substantial ip swing which irritates me a little.
Currently SP do not offer the MK19, apparently only a small ip swing, as a set with the G260 only in black tech/carbon which is a pretty penny.
It is correct the two are not sold as a “combo”, but one can order the Mk19 and a G260 as two separate units. Now, the Mk19 and G260 Black are being sold as one unit. It is pricey and it looks really good. If one has the money and wants it, as a friend of mine did, then go for it.
The IP swing has no impact on recreational diving. The reality is, only the technician is going to notice it when checking the IP during servicing, assuming the tech checks it at 3000 and 500 psi. Otherwise there is nothing to worry about.