Personally, I've never heard of those load cells, maybe I don't get out much. I've used Sensotec and Cooper
http://www.mrplc.com/sites/moreinfo.cgi?145 Cooper
http://www.mrplc.com/sites/moreinfo.cgi?206Sensotec
Both places have amplifiers that can be purchased with VOLTS or AMP outputs. I've had extremely good luck using both, they have a wide selection, and the sales staff is very knowledgable when you call them on the phone.
I was also impressed with there stock, generally Sensotec has a turn around time of one to two weeks. I've crushed many load cells in my days, and I am glad Sensotec keep them on hand....