The Starcraft Marine Aurora 2000 I/O 2004 vs Starcraft Marine Nexstar 2100 2005 comparison sits squarely in the category of decisions where specs alone won't tell the whole story: intended use, storage, and long-term ownership costs all factor in.
The power gap is worth calling out. Rated to 300 hp, the Starcraft Marine Nexstar 2100 2005 has a 40-hp advantage over the Starcraft Marine Aurora 2000 I/O 2004's 260-hp ceiling - enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Both carry nearly identical fuel loads - 51 gal and 50 gal - so range won't be a tiebreaker here.
For family outings this is probably the sharpest distinction between the two. The Starcraft Marine Aurora 2000 I/O 2004 is rated for 12 passengers, while the Starcraft Marine Nexstar 2100 2005 caps at 11. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Starcraft Marine Aurora 2000 I/O 2004 could be the deciding factor.
Bottom line: Choose the Starcraft Marine Aurora 2000 I/O 2004 if your priority is putting more people on the water - it handles 12 passengers and at 0,0 ft it has the deck room to back that rating up comfortably. The Starcraft Marine Nexstar 2100 2005 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 11 that costs less to run day-to-day.