If you exchange a 1-week 1bedroom into SFX (let's say, Las Vegas), that'd cost you 3400 points I think.
Then if you join SFX at Platinum level, you can also get a "free" upgrade (book a 2 bedroom) if available.
If you're going JUST through Hilton, I think there's only one resort with bronze season left, all the rest are gold/silver, in which case sometimes the 4800 RCI for 2-bedroom is your best bet (like in Hawaii it's was cheaper to use that route than say, 7,000 points for HGVC 2 bedroom)