Podcasting Microphones

Now that I have a new recorder on the way, I'm thinking about my microphone set up. Currently I'm using a few different options and have a number options at my disposal. In order of frequency:

1. built-in mic on my Clie PEG-NX70V/U


2. Audio-Technica ATR55 Telemike


3. Sony in-ear phone mic


4. Samson Airline Micro Wireless Lavalier Mic


5. Radioshack Lavalier Mic

I was thinking that if I use a Y-splitter I can use two mics at once for recording sessions. But which mic's should I use? Should I use lav mics on my guests since those mics are inobtrusive and then the shotgun mic for myself? I need something that will capture everyone talking, but still isolate the sound and keep the quality as high as possible. How will the quality suffer if I have three or four mics attached through two to three Y-splitters? I suppose I should use a 4-channel mixer and pipe the feeds into the R-1 directly. It would give me more control over individual mics. I wonder what kind of portable mixers they use? Perhaps I should have just bought the R-4. Damn. What to do? Well, since the R-4 weighs in at $1600, I don't think that'll be the way I'm going to go. I guess I'll make the R-1 work. I'm sounding spoiled now.