The 1784-KTX is no longer available and AB recommends the 1784-U2DHP. Another Wonderware DH+ converter option is the Automation Networks http://www.automation-networks.com ANC-120e, USB to DH+ PLC Programming Cable. It works great with the WW DAServer (ABCIP) and is priced under $1,000 USD. It also comes in a "pocket-sized" ANC-100e, Ethernet/IP to DH+ with Din Rail/Desktop. All ANC DH+ converters have auto configuration with makes things much easier for setup and fast throughput as it uses the Controllogix Ethernet/IP Driver, even in USB format.
Thanks Mathew