The HTR 6090 looks really close to the RX-V1700. It has many of the same features.
I have not personally heard it, but if it is basically the same RX as the RX-V1700 it should be a nice unit.
RX vs HTR would seem to be all about marketing and distribution.
Here's the official answer (from the Yamaha RX FAQ)
What is the difference between the RX-V line and the HTR line AV receivers ?
There are many similarities between these two product lines. The RX-V line and the HTR line are produced in the same Yamaha factory using the same high quality parts throughout. The RX-V and equivalent HTR models have the same warranty periods; the same manufacturers suggested retail price, the same features, and the same remote control units. There is a cosmetic difference found on the front panels of these two lines. The RX-V line maintains the traditional white colored lettering normally found on most Yamaha components, while the HTR line provides a slightly different approach. Yamaha has created a new look by using gold colored lettering in selected areas on the HTR receiver series. However, both the RX-V line and the HTR line feature the same high quality black metal front panel construction. The amplifiers in the HTR and RX-V units are identical but rated differently to comply with the accepted measurement standards of their respective channels of distribution. Both ratings are FTC approved and are designed to handle the dynamics of today's audio and video sources. The RX-V line has the power amplifiers rated from 20-20000 Hz. The HTR line has the power amplifiers rated at 1000 Hz. Both lines can reproduce the full frequency response of 20-20000 Hz. The RX-V line is typically sold through Yamaha authorized audio/video specialty retailers, and is not available for mail order sales. The HTR line is sold through mass merchants, catalog retailers, and department stores. You may also purchase the HTR line through the mail. All transactions must be done through the authorized Yamaha dealer network. Any purchase made from an unauthorized dealer/retailer voids the Yamaha manufacturer's warranty.