I suppose an Acura 1.7EL would work. Should be easier to find.
I would suggest anyone looking at those, unless were taking in the 4K range just move on to the 2006 and up Civic. Leave all that T-belt, water pump, rollers and tensioner to someone else. The autos were junk, the seats are horrible.
As for the CSX, I doubt the current market price would justify the purchase over a loaded Civic. Factoring in the cost of 91 octane, I'd say the fuel premium will be at least 30% over the 1.8 Civic.