The Zoom H4n does have 4 channels of audio it can record, but only two of them are from external sources. same with the DR-100. I like the Tascam products more than the Zoom. They have less self induced noise (noise floor) than the Zoom products. I have had a DR-100 for a long time now and it has seen some serious work. It spent a day taped to the coal tender of a late 1800's train and recorded perfectly on a set of lithium AA batteries and its internal rechargeable battery. It also got rained on and was still recording after a 6 hour shoot. Now it is a bit big and bulky, but it does so many more things better than the H4n I can deal with the increased size.
Now with only a budget of $1000 you are going to be hard pressed to get a great audio set up. I personally like good wireless systems as I use them every day I work, but with your budget in mind its going to be tough to find a pair of wireless and get a recorder too. But there are places to look for quality, good used gear. The place I have spent a ton of money at and they are good folks is Trew Audio WWW.trewaudio.com
They have a consignment section there that has all sorts of good used gear. try to find some Sennhieser G2 wireless units or even a pair of Lectrosonics used VHF or UHF transmitters and receivers. Often times they will come with a lab mic in the package. But agai , even used gear is going to set you back a good amount of money. so be prepared to open up your wallet a bit wider. There is a lot of crap audio gear out there on eBay that you should stay away from. Stay with the known brand names like Share, Sennhieser, Audio Technical, Lectrosonics and others. They will cost more, but in the end you will be happier and spend less.
The cheaper idea of using lavs and Zoom H1s isn't a bad idea. But you will have to keep track of all that gear and sync it later in post. That could be your best answer for staying under budget. The H1 will be noiser than any other recorder and you won't be able to hear it to make corrections if you get a lot of clothes noise or rubbing on the mic. Kind of a disaster if that's all you get and you only find out until after the wedding and reception is over. This is where a wireless system can save you. At least if you listen in you can make corrections possibly.
Also, I wouldn't totally abandon the sound you can record on your camera. Having a directional shotgun on the camera can prove useful in some situations. It won't be your front line audio, but it can help when the recorder and lavs are too much or too slow. You should have a mic on camera just to help capture those moments that you can't be ready for with the recorder. A camera mounted mic will also help you with just gathering ambient sound that maybe the lavs can't or won't be able to. Its just another track or two of audio that shouldn't be thrown away. It can also help in post with syncing. where the built in camera mic might not gather enough clean sound, a camera mounted shotgun will reach out and get sounds that other mics won't be able to.
I've done proffesional audio for 18 or so years. I've been apart of a lot of different TV shows and been in a lot of different audio and micing situations. I even worked on a show for TLC called, "A Wedding Story." Not an easy show to shoot or work on as an audio person. Sometimes brides turn from normal humans into these raging Bridezillas and scream at everyone, especially people trying to put mics on their ill fitting wedding dress. Just wash your hands before you attempt to do that. Leaving a smudge on a white wedding dress will get you killed. Weddings are probably one of the tougher ones to do right and well. Good luck!
