A3+ - Epson 1290, Epson R1800
A4 - Epson DX4050, Epson Stylus 895
All bar the 4050 use an Inkflow system, which makes the running costs much much cheaper, while retaining print quality (I sell photo's, both these points are paramount). They are also easy to service myself, (The 1290 was in bits last week, dust on the rollers, not pulling in paper. Patient is now stable).
I also have an A2 printer stashed away in the garage, but I've not used it in... ooh... 4 years now (Cleaned and purged prior to storage). I think it's a 2000 or 3000 series model.
Must get round to selling that.
EDIT
Re-reading the thread.
@Ripster... Inkflow system. you can score one fairly cheaply on the bay. much much cheaper to run.
@Rajagra... Good choice. I prefer this over the R1800. has been stripped and repaired many times, but keeps on ticking. Best of all, it cost me £10!