- An engine that loves to rev and sounds good doing it

- Sharp handling, slick six-speed manual transmission

- Upscale interior look and feel

- Long standard equipment list

- Top-of-the-line navigation system

Some potential buyers might be surprised to learn that the Acura TSX comes with a four-cylinder engine only. This is a luxury-branded car, and even the Accord can be had with a V6, right? But from Acura's standpoint, the four-cylinder has advantages in weight reduction and price while still making competitive amounts of power (205 horsepower for 2006).

Honda and Acura are well-known for their intuitive, ergonomically efficient interior designs, and the TSX is no exception. The expansive cabin is instantly inviting. Soft-touch leather abounds, with no cheap, hard plastic surfaces that allude to cost-cutting measures. Like its TL and RL siblings, the 2006 Acura TSX is truly a luxury car. The TSX competes mainly with lower-end versions of the Audi A4 and BMW 3 Series, as well as the Lexus IS 250 and Volvo S40. While it doesn't really have the prestige of the German cars, the Acura TSX rates highly with us because of its premium interior and very impressive standard features list. If a luxury-branded vehicle is what you must have, you should know that this Acura car is the most refined example of a well-equipped entry-luxury sedan under $30,000 and fully deserving of any attention you give it.

The Acura TSX entry-level luxury sedan has seating for five passengers. It's available in only one trim but with such an extensive standard features list you're not likely to want anything more. Included on every model are items like 17-inch alloy wheels; HID headlights; heated, power-adjustable driver and passenger seats with driver's memory; leather upholstery; an eight-speaker, 360-watt audio system with XM Satellite Radio and an in-dash CD changer; dual-zone automatic climate control; and a sunroof. An impressive DVD-based navigation system with voice-activated software is the only option.

Four-wheel antilock disc brakes with BrakeAssist, traction control and a stability control system are all standard. Side-impact airbags for front passengers and side curtain airbags for both front and rear occupants are also standard. In front-offset crash testing conducted by the IIHS, the Acura TSX received a rating of "Good," the highest possible, and a "Best Pick" designation. In NHTSA tests, the TSX earned a perfect five-star rating on all counts, except for rear side impacts, where it received a four-star rating.

Inside, the Acura TSX offers a beautifully furnished interior that looks and feels more upscale than you would expect. The driver-oriented cockpit has large, easy-to-read gauges and controls and performance-engineered front bucket seats that feel great. Rear legroom is more generous than in most competitors and passengers will find plenty of foot room under the front seats. As in other compact luxury sedans, a fifth passenger will suffer in the center seat.

The TSX's 2.4-liter four delivers all the sophistication you'd expect from an Acura car. While a four-cylinder is usually not ideal in a luxury car, this one is so refined that some owners may give up on V6s altogether. The smooth six-speed manual transmission is well suited to the 205-hp four, and shifts are precise and the gates easy to find. Of course, you can't go wrong with the smooth-shifting automatic, either. Handling is equally impressive, if not more so, as the steering is quick and exact while the precisely tuned suspension holds body roll in check. During more subdued driving, the 2006 Acura TSX never forgets its luxury branding and delivers a solid, compliant ride that always feels just right.