Decor Costs

I'm contemplating Jericho Terrace, the Dome Room, but I would love to bring the decor to the room..at this point idk if its worth the extra money bc they are fairly priced,plus I'm sure I can negotiate. I would love to change the chairs (either chair covers or change the chairs all together), table linens, flatware, plates...anyone know a rough estimate how much extra that would run me? Also, any recommended decor specialists? All I know of are W Events bc of my visit at Woodbury CC..they do good work! Also how much would huge centerpieces cost roughly for 20 tables? Havent crossed that bridge yet, and was wondering how much to expect..thanks!