umphrey's is pretty sweet.
ok, first question, what kind of laptop do you have? you will need adequate hard drive space, at least 6GB free for recording at all times.
what kind of batteries do you have? not likely you'll be able to get ac power at many clubs. i recommend the valence n-charge as a portable power solution. this will run you around 250-300
the ua-5 is a nice low cost unit. you can get it for under 300 and it will work for you. you do not need a mod if you are using it with your laptop over usb (the digimod is only necessary when using it standalone into a dat or jb3). there are other options you could look into, like a used vxpocket v2 to use to patch with until you can afford higher quality outboard gear (mic pre-amp and analog-to-digital converter).
as for mics, there are so many options. assuming you purchased an n-charge and ua-5 as mentioned above, you're probably out of money by now. but you can still patch, and save for mics.
also consider with a laptop you will need to customize the operating system to be stable.