Bargain a lot more, or just get a new LX. Invoice for a new '07 LX is very low $18's (something like $18,150). With it looking like $1k below invoice is currently a reasonable expectation for new 2007 Accords, I think you should be able to get a new 2007 LX for low-$17k's, or only about $1000 to $1500 more than the deal you've worked out for the '05 LX.
Better than that would be a 2007 SE, which invoices for upper $18k's (about 18,850), which means you should be able to snag one for mid-to-upper $17k's. The SE will offer a nice step up in equipment, as well as factory alloys.
