A lot of people end up needing to put a 4-6 inch spacer on the column so that the nose to table height does not get in the way of too many milling operations. This is the basic reason I stepped up to the G0730 8*30 mill rather than the 6*26. The extra 1 sq-ft on the floor was not a problem in my shop. The 8*30 is also about 250 pounds heavier, and likely stiffer.
I have a second hand earlier version of the G0730, mine is G1008. Looks to be very similar to the G0730. I have had this for about 14 months. I think it does not take up much more space than the G0801. I would not find the G0801 too limiting in travel, especially in the knee vertical travel. A number of tools consume a lot of nose-to-table distance.
The G0730 is on closeout for less than the G0801. If a G0730 is available for less price, it will not take up much more space than the G0801 and will give you a lot more capabilities.