I would love to see Raja here, but at this point, I'd rather see Radmanovic. I feel the need for a taller bigger SF. He's not a "great" defender, but he's longer and younger than Bell. His contract has a player option, so he could cut himself next season or not. Plus backing up Pierce means coming out to either guard the starting SF for a few minutes, but mainly guarding bench SFs. Plus he could play PF and also hit a ton of 3s if needed. I like his shooting touch more than Bell's.
On another note, I'd hate to trade away Scalabrine. He fills the hole for backup PF and C AND can hit the 3. I would only include him in a trade if the other team didn't want him and planned on buying him out.