Hey there, welcome. I think your budget is either very tight or a little tight, based on what you already own and where you prioritize stability & usability versus $$. I'll share what I'm doing, and if you're interested in any details I can elaborate. I've also put an overview on my personal website shown in my sig.
- I'm doing 3zone speakers, [within a few weeks] climate control & irrigation control, and full H/T (DVD,TV,CD,XM) with my HA/HTPC system.
- I use a cheap PC to do the HA/HT control. Check out my website, barring my 2.5TB in HDs, it's probably <$1000.
- I use CQC [www.charmedquark.com] as the software engine and front-end designer to do the climate, audio [CDs & XM], irrigation control. I can create a single interface to runs on my PC, tablet PC handheld viewer, and PDA as described below. I've opted to create a smaller version of the same interface for the PDA for size purposes.
- I use a cheap handheld tablet P3-400 [Fujitsu Stylistic 3400 running WinXP, $250 on eBay] with a wifi card to do roaming control.
- I use a cellphone PDA (Siemens Cingular) for audio control when I'm on the patio [and don't want to put a tablet PC next to the barbeque grill ]
You also want to do security & lighting. I'm probably going to get the Elk M1 automation panel to integrate security, and the next gen of zWave out in a few months to handle lighting. Both of these are integratable with CQC, so I'm going to stick with a common UI [or at least integrated with the other components], so there's a high degree of usability by the non-technical folks.
Let me stop there and see if you want more info on anything I've done, or have specific questions about where you want to take your system.