It will fit...but, the kv is a bit high for the intended use.
Either will fit. As for your "budget" option, as with the Castle option MIke mentioned, the kv might be a bit high.
Regarding the Rlaarlo electronics, as I mentioned in my post yesterday, while their motors are extremely good, most of their ESC's should be avoided. For anyone getting, or looking to get, the DSK, I will definitely recommend the Rlaarlo motor...but, for the ESC (especially for those who want to "save money", my best recommendation would be the C8 (160A, 3-6S) or C6 (200A, 3-8S) ESC from XC-ESC. The C8 measures 59.8mm x 48.2mm x 35.9mm, while the C6 measures 69.2mm x 56.8mm x 42.3mm (which might be too large for the DSK, unless the ESC is modded). By comparison, the Castle Monster X, mentioned by Mike, is 53mm x 49mm x 36.4mm).