The Selenium D3500Ti is a very good unit, but it is pricey (as most all neo units are). More cost effiective are the Selenium D4400Ti (4' dia) or the D3300Ti (3" dia). Both have very good extension, but are again heavy. A good buy are the older D405Ti or D408Ti. These are a bargain if you are on a budget. Again, heavy.
If you want very smooth neutral midrange, the D405 with a phenolic diaphragm is great, although you will need to use a tweeter with it, since it rolls off above 5k or so. This is my personal favorite in a 2" compression driver (from a hi-fi perspective). I dont mind using a seperate tweeter, and would do so even with the wider range units using titanium diaphragms, due to beaming with any decent midrange horn. If you havent used Selenium products, do yourself a favor. The favorible exchange rate makes them a real bargain compared to JBL, or the European offerings of similar quality.