Tour Edge Exotics 4W, 16.5*, is one to consider. Comes from a long line of solid FWs. PGA Tour pro Brandt Schnedeker plays Exotics for no promo money - he likes them because they work. If you could find a 2012 model, you could save $100 (Exotics are pretty pricy bought new).
A second one might be a Mizuno FLI-HI Hybrid Iron, which emerged in 2010. If you could find an 18* 2H (39.25" shaft), this might make a good option between a single fairway wood and your 3i. (If you could find one of these in a trade-in rack, you might really like it.)
The model has shifted in 2013 to the JPX FLI-HI Hybrid DLRs (direct long-iron replacements). 21* 3H (probably same as your 3i) is longest club for the new model.
You might also look at the 2013 Callaway X Utility Prototypes. Lowest-lofted version is 18*, with steel shaft 39.75" long, or graphite 40" long.