I'm pretty sure that my existing pump has died, and I keep hearing that a Variable Speed pump is what I should buy. Is it really much better than a basic single or dual speed pump? I'd like to avoid the high-end pumps that cost thousands, but I need something strong enough to pull my Kreepy Crawler (cleaner) around the pool and provide flow for the SWG. Any recommendations for pumps would be appreciated. Also, with a VS pump, will I still need my existing timer, or will I just bypass that when I install the VSP?