kater1: I have heard (never personaly tried) that using ammonia based windex on a q-tip works pretty well, and soaking a paper towel in windex and setting the printhead on it (caution - messy) for a few minutes can help a very clogged printhead. This will not help if it is burned out though.
I was always careful to get seperate ink cartridges and no 6 color printers since the printers were all for general purpose and produce lots of text (kids homework and such). If you produced alot of text on the S960 (a 6 ink printer)that would have shot up the ink costs and done it slower for limited benefit.
If you need a new printhead and can get it for under $100, I would get one since the printer you have can use after market (I use Swftink) ink at less than 1/2 the cost.
Silvertrine: I don't know if you've been unlucky or what . I can only say that my experience has been different. Of course, HP will work for you if you exclude Canon, and since Canon has introduced the "chipped inks" now they lose the more dramatic long term ink cost advantages you could have enjoyed with 3rd party inks.
I've been loosely following inkjet reviews, newsgroups, and forums since 1994 and the Canon BJC600 (still working !) and this is only the second time I've heard of Canon printheads prematurely failing. As to similar cost per page with OEM ink, that hasn't been true since the HP895 days, and hp's prices went up since then. If you count after market inks (the family has shifted to Swiftink) the Canon advantage was even better until the recent "chipped inks" introduction.
I am the "computer guy" for the extended family and there are currently about 6 Canon printers and none have failed. They include the BJC600, a 750, an I850, and 2 IP5000s. In all fairness, all the HPs work also, they just cost more for ink (except the HP895). Epson is a different story (head clogs) and I no longer consider Lexmark to be an actual printer at all.
Good luck to all
Jim