There are lots of break-free UPS units available. You have to make an assessment of overall power level you need for your studio (then double it) before you can start to make any sort of UPS choice. Battery capacity is not a problem, as all you require is cover for the few seconds duration of the power gap or the time before your aux generator gets under way.

I have always gone with APC, but recently have had good experiences with cyberpower (which is a bit lower price point). APC certainly has more options, though, especially if you want to deploy a centralized solution.

Good pro audio ups units aren't cheap. I use primarily Furman on critocal pieces and various Cyberpower and APC on non critical gear. All are rackmounted. The primary consideration is clean filtered power. Secondary is rackmount capability and tertiary is that the batteries are user replacable. UPS batteries life span is 3-6 years. I cycle batteries usually at four years or if the ups has been smoked.

Note: most consumer ups units don't filter power for noise etc. That just isn't a consideration for home users. Server class UPS units tend to be better about this.

We have everything running thru Furmans so the emi / rf filtering is being dealt with at that point.
Oddly enough the area we are next to US Gov land -a radio transmission free zone believe it or not!
Main goal is to have a seamless transfer when landline power goes out.

We use APC, Furman and Libert (Now emerson).
http://www.emersonnetworkpower.com/en-US/Products/ACPower/Pages/default.aspx