I would agree with the last comment above mine. I have an HP DV8t which came with a non beats but very decent onboard sound, again with the 3 Altec Lansing built in speakers (i.e., tiny sub below). Of course the onboard speakers are pretty bad, but better than anything else I've heard built into a laptop. But initially, I was pretty impressed with the sound quality coming off the on board sound via the laptop's headphone jack. Especially for movies.
However, eventually I upgraded to an external USB DAC/Amp (see sig for details) and after using that for a while now I really can't even bear to listen to the on board sound anymore. The difference is that substantial (which it should be for an approximately $400 upgrade for the external DAC/HP Amp & pre-amp). It was money very well spent, imo. No regrets.
So I would say maybe skip the Envy/Beats but get a bargain priced HP Pavilion (one of the models with excellent hardware and specs aside from the built in audio) and then spend the money saved on a decent external DAC/Amp of your choice. The only solid reason I can think of for getting an Envy (aside from the slick cosmetics, if that sort of thing is appealing) is so you can add an optional built in 1920 x 1080 resolution infinity display.
My DV8 Pavilion came standard with an 18.4 inch 1920 x 1080p built in infinity display (awesome laptop display btw for an "entertainment" oriented machine) and was an incredible bargain for the ~$1200 (on sale price plus discount coupons) or so I paid almost a year ago considering all the power (e.g., i7 CPU, decent GPU w. 1 GB vram, etc.) and other great specs/features it has, but HP recently discontinued the DV8, imo, probably to force people to pay up for an Envy if they want to get a laptop with a truly high quality display.