You really only have need of a UPS if you have equipment that requires cool down before power off (ie, front projector) or anything with an OS (HTPC, automation system).

If you like the Alesis, I'd go with it. The only meaningful advantage of the Monster/Panamax units is protection from undervoltages (by shutting down), but if your power is not prone to them it may never matter. Otherwise they're overpriced (esp. Monster).