should I migrate to Nvidia?

If you are crashing due to your AMD drivers, it likely has something to do with an issue with the card's hardware, considering how remarkably stable these cards are for being brand new.

Which could mean overheating (which would cause more noise, and could be a result of your attempted mods), or, probably, lack of available power. The R9 290 is a hungry card. On my box, Sapphire put a sticker over the initial requirements to note a 750W power supply... especially if you're trying to overclock.

The Reference card runs into a lot of issues with power and heat. Especially if you've attempted mods. I hope you haven't tried to overclock in conjunction. The Non-reference cards will be much, much better in both categories (unless they use a reference board) but... BUT!...

The 780Ti will blow it out of the water all the way up to 4k, and do it consuming less power. That specific card won't be quieter than Sapphire's offering, but it will be too quiet for you to notice, unless you're running with the side open and otherwise passive cooling. Sure, Anything less than 1440p will be a marginal difference in framerate, and wouldn't be worth the extra omph, but at 1440p and higher, with hungry games (and future games) like Crisis 3, You will see some benefit to the 780Ti. It will be some time before textures and shaders make 3GB too little to run at 1440p (you won't run into issues unless you're pushing at least 60% more pixels), and by that time, you'll be looking for a new card, anyway.

So... ultimately, especially with the Hawaii-series mark-ups due to bitcoins, the 780Ti is probably your best bet.

Edit: Also, Drivers. Nvidia's drivers are no more stable, but they are more efficient: they take up less CPU time than the AMD ones and therefore run cards faster on worse processors. Not an issue in your case, unless you've got a whole lot of background tasks, but notable.

Also, while I'm getting along great with my Accelero Xtreme III on my 290X, it's not a mod I would recommend to the faint of heart or inexperienced with thermal compounds. It took a lot of work to get those VRM's to cool well enough, and I had to improvise for the Memory Modules (though I'm not sure they needed it, being high quality and rated much faster than the card will let them run).