The affordable large car segment is starting to get just a little overcrowded, and in a time where customers all around the world are downsizing to smaller midsize models, performance, fuel-economy and overall value is now more important than ever. South Korea’s entrants in this field have been winning plenty of accolades lately, especially newcomers like the Hyundai Genesis, and Kia is working on another large car that by the looks of things will only continue this trend.

On display this week at the Seoul Motor Show, the new KND-5 concept from Kia is a preview of a brand new “near luxury” the South Korean carmaker is planning. The concept was previously thought to be of the upcoming 2010 Amanti (Opirus) but Kia plans to sell two sedans in this segment, the Amanti as the more affordable model and the production version of the KND-5 as a slightly upmarket option.

Both cars will be based on a common platform codenamed VG, which will also be used for the next-generation Azera (Grandeur) sedan. Dimensions will be very similar for all three models, with the KND-5 measuring in at 4,945mm in length, 1,850mm in width and 1,475mm across. Under the hood will be a 3.5L Lambda V6 engine.

Distinct elements of the KND-5 include LED headlamps, Kia’s new H-pattern grille, 20in alloy wheels, and a panoramic sunroof that extends from the front windshield.

The production version of the concept is due to go on sale in South Korea towards the end of the year and should be on sale alongside the new 2010 Kia Amanti in the U.S. early next year.