I completely agree with the first three, but I'm not seeing the "need" at the other two positions.
WR - Edelman, LaFell and Amendola make a top three that is very good. Then, between Dobson, Tyms, the certain late round/UDFA prospect du jour, the couple scrap heap signing and possible Boyce/Wright, you've got more than enough to expect a couple reasonable options emerge.
I'd like to get a game changing outside presence as much as anyone, but NE is built from the inside out, so I'm not seeing the need other people are.
As for RB, they lack the long-term options, but Blount seems unlikely to go anywhere else if he earns another contract and the Patriots have lots of young options. It would take a remarkable confluence of events to think RB is problem area in 2015. It seems likely they pick someone in the 4th(ish) round to give a red shirt to, but I doubt they make an earlier selection. If so, IMO it will be more due to arbitrage than need.
Personally, I'd put safety and LB over both of those.