well i think it could be time for an up grade

i've gone from a Chester conquest to a Sieg C3 to a Sieg C4
i've sorted the workshop today and i'm now thinking about getting a bigger lathe.
now to the question!!
space is limited, what depth of bench will i need for a bigger lathe, i'm thinking about 250mmish dia swing, varible speed lathe.
i'll be mounting direct to the bench, no swarf tray.
any recomendations???? i'd like power cross slide, if i can
