for an NA car, the TSX is very responsive to mods if you are into mods. It benefits 20+ WHP from bolt ons and reflashed ECU. This can be done for ~1K and basically doesn't affect reliability.
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invoice is 25K.
for 2006, there will be a 6MT V6 accord sedan available and HP increased to 250. If past is any example, probably EX only trim for 6MT, but it includes bigger brakes, bigger wheels/tires, different intake, different intake manifold. EX has leather and sunroof. Invoice typically ~24K. Stock handling on this car is a weak point, but it benefits alot from a $50 OEM TL rear sway bar and 30 min installation.
G35 is available with a 6MT/sedan, it gets more HP at 298 (vs 280 for auto) and sport package. Invoice for a G35 6MT sedan is ~28K, which is close to a realistic market price. Sunroof is not standard, but 19" wheels, MP3, HID and leather is.
Legacy GT if you buy, apparently this is the last year for cloth option if you want to reduce the cost and invoices ~24K. Leather+sunroof is 1k more.