Finally, something I can help out with!
IMO, your answer is the Alesi Protrack. Its available at B and H for only $149.
http://www.bhphotovideo.com/c/product/579664-REG/Alesis_PROTRACK_ProTrack_Handheld_Stereo_Audio.htmlLet me tell you, I did a lot of research about recording to ipod/iphone and this is the best option for your money hands down. You can plug the XLR's straight in to the device for sounboard recording, and you can just have that set of XLR's with the various adapters to allow for RCA patches, XLR male/female conversions, etc. I've recorded several shows with this, I use the phantom power feature and it is my only piece of equipment, mics straight into the protrack sled ino the ipod. Haven't done too much with the internal mics, but they sound about the same as any X-Y internal mics, nothing to write home about, but not terrible.
There are also a great deal of remote power options for the protrack. If you are recording from the SBD aren't using the phantom power option, you can probably get 4 hours of recording from a set of 4 AAA's, so 2 sets should be more than enough for most shows. However, you can't use AAA's and be able to phantom power, but you can easily buy a couple aligator clips at radioshack and wire them to a 2mm adapter tip with center positive and connect to a 6V lantern battery. The Rayovac Ultra Heavy Duty model has gotten me over 20 hours of recording with phantom power for only $4.88. If theres an outlet available, there's an AC adapter included obviously.
A few notes:
-The one drawback ive experienced is the safety of the dock connection to the ipod/iphone. Without the right thickness foam on the sled, it is easy for the device you are using to come loose from the connector, and from there on youre recording is all static (it sucks...). However, once i got the right thickness foam, I haven't had any problems, no static whatsoever.
-To record on the iPhone, youll need to get this program ($2 i think):
http://www.iprorecorder.com/-Idk if you can make your phone be on an "airplane mode", but i'd do some research to see if you can because its really annoying to receive texts, NEVER have your phone on vibrate if you can't turn the ring off, it will come out of the sled on the first ring
-Recordings are about 2 gigs for a 4 hour show so make sure your iphone will be big enough
PM me if you want any more info. I'm probably one of the only people here using an ipod and its for budget reasons, but theres no need to compromise, this thing is definitely the best of the best for ipods/iphones