Get any that operates at 1800 Joules or more. Wal-Mart has excellent ones in the Electrical Department rated at 3400 Joules for about $35.
A lightning strike can fry a computer regardless of whether you have a surge protector, but much of the lightning that will destroy a computer is of low intensity where you do not see the flash. The lightning comes down the telephone line or the cable line or the powerline, and zap, you are dead. The 3400 Joules unit will protect you from most all lightning, but be sure you have one that also prevents the spark from traveling down the phone line.
Those with a 550 amp, or higher, battery, or one that will give you 11 minutes or longer to shut down, are best, but expensive. The battery should be tested or changed at least yearly. A battery unit that costs less than $100 is suspect. You never know if they will work right when the lightning comes.
Avoid: Belkin, Tripp Lite, Ativa, Kensington, and Targus. We who live in the high lightning Southwest know that these brands are absolutely lousey in protection, despite how pretty they might be. APC American Power Conversion, WilCan, Maxivolt, Monster, KCP&L, and Coast Electrical Power are among the good ones.
Ideally, you want a wired system that your power company will install in the electrical box.... foolproof and reasonably priced.
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