Had a DIR-615 previously and really liked it.
Then i went and bought the linksys WRT150N and it was a steaming pile of junk, infact i've had nothing but problems with the last 2 linksys routers i bought. Random connection drops both wired and wireless, router becoming inaccessible amoung other problems, seemed the wired ports would stop working after a period of time and you'd have to move your wired connection to a different port on the back of the router.
Anyways went and got another DIR-615 during the days of dell, had it 3 days now and not a single problem, even managed to come with the completely up to date drivers unlike the Linksys, further more setup and changing the router settings is 100 times easier with the Dlink then the Linksys. For some stupid reason I keep forgetting to learn from my mistakes and end up buying a Linksys to try when i need a new router. *thumps head on desk*
so to sum things up
Dlink DIR-615 >>>>>>>>> Linksys WRT150N