I am sure that the Halcro will work fine.
Suggest you look at the Panasonic 30,35,50 and 55 or the Sony S550 for bang for the buck.
Haven't heard the Marantz but they have had an excellent rep for a long time. Looking at the spec sheet the main difference seems to be that the Marantz has an Anchor Bay video processor which is newer then the Reon in the Integra.
FWIW Oppo's highly acclaimed 583 also uses Anchor Bay technology. However as I have discussed elsewhere, unless you have legacy sources like a nonupsampling DVD, a VHS deck or a Laser Disc player you will probably never use the technology.
Other then that, I suspect that the Integra and the Marantz are probably close enough in performance and features that price is a reasonable deciding factor. Put another way its not at all clear to me what makes it worth twice as much as a 9.8
IMHO you would be better served to invest the difference in HDMI sources.