I'm sorry to inform u that the only one that works with Minolta's HSS is the highest end hot shoe mounted flash, the 54 MZ-3 and 4. The price of the Metz flash should b slightly cheaper than the current Minolta 5600HS. but u can get the 3600HS instead, but u lose the side to side swivel on that model.
Alternatively, if u r just wanting to use the High Speed Flash with the flash mounted on the hot shoe without swivel, then u can get around it with a second hand 5400HS. The advantage of the 3600HS and the 5600HS is that u can do WIRELESS HSS also. u can't do wireless HSS on the 5400HS, just wireless flash sync at 1/60sec. if u want to use off camera HSS, just get the off camera cable OS-1100.
Hope this helps
Matt