Okay...

Turbocharging the 3.0 liter V6 in the Accord will be a bastard for several reasons. First, there's no sort of ECU reflash or piggyback that you can throw in there and make it run correctly. So you're looking at $1000 for an AEM EMS or a LinkECU right there and/or some sort of AFC unit.

Secondly, nobody makes a kit, which isn't a bad thing, but it's a little more work. You need to piece it together yourself.

Oh and here's the glorious part about the J30's post 2002, they have the exhaust manifold inside the engine. So yeah, have fun with that.

An option you can do is to get the Comptech supercharger (www.comptechusa.com) which is carried and is warrantied by Honda and Acura. It's a bolt on kit so installation is pretty simple. Comptech lists the supercharger kit to fit only 98-02 Accords, but they'll be releasing one for the '03+ within a year. For demonstative purposes, the supercharger kit made an extra ~45WHP, so about 245 crank HP and ~200WHP. It's $3,995 which is a little spendy but is really your only option besides shooting a snot load of nitrous into your engine all the time.

So it basically comes down to this. You can have a reasonably quick Accord by throwing on the Comptech supercharger and being done with it. However, the K24 in the TSX offers a lot more potency if you really want high horsepower figures, and you are able to turbocharge that motor with relative ease (aside from converting it from drive by wire back to drive by cable).

Personally I think the Accord 6-speed would be more than enough to entertain you. If you want to run with an EVO and don't want to spend ridiculous money building a car, then get an EVO.

Also the whole SOHC or DOHC thing doesn't really make a difference. Honda uses DOHC designs in their higher horsepower 4-cylinders because you either need displacement, revs or forced induction to make power. Honda chooses high revs. DOHC's can withstand higher RPM easier because there's two cams, one controlling the intake and one the exhaust valves, so there's less rotational mass. SOHC uses one cam with rocker arms to control both. Plus with DOHC it eliminates the SOHC rocker arms which is just more mass and less stable at higher revolutions.

SOHC is used on most of their V6's and lowlier 4-cylinders because it's a simplistic design, it's a lot quieter in operation (theoretically), and most of their V6's already have decent displacement to work with anyway.