My vote is for these. Love them own about a dozen of them now. Next vote would be for MK250/G260
Yes if your US based then pricing for Apeks stuff is kind of crazy for some reason. I buy all my gear used and cant say I have paid more than USD $300 for a DST/XTX50 combo.
If price is your main issue then my vote would be Deep 6
Last I looked maybe 18 months ago the Apeks XTX50/DST SM set was $1500. Who knows what it is now. I got my two regs about a year apart then put them together for SM.