The best inkjets for graphic design are Epson and Canon. I have the Epson Stylus Photo 2200, it's a superb printer, up to 13" wide. The driver software is somewhat finicky.

The Canon i9900 is also well respected.

When you say text and vector graphics, in a design environment you are talking about Postscript. Inkjet printers with a very few exceptions are non-Postscript.
You will be trusting OSX and the print driver to handle your vector graphics properly.

I bought a Canon i9900 and I have been very pleased with it. I bought it primarily for photos, but it should do a good job on vectors. I had thought about an Epson, but the computer guys on the radio said that the Epsons tend to clog up. However, after I bought the Canon, I read that while Epson offers the long-life inks, Canon elected not to; so if long lasting prints are important to you, you may want an Epson (I think their long-lasting inks are called Ultra Chrome). Like the Epson Stylus Photo 2200, the Canon i9900 will print up to 13" x 19". If you are running Mac OS X, borderless printing doesn't work very well; it gives you a bigger print space, but not all the way to the border. Have you thought about a laser printer? There are several under $200 now, including an HP, that print 600 x 600 dpi.

Bob