welcome to soft!
H4 is discontinued already
H4n is the new hoohah
H4n's features are superior compared to H4 , the only thing that makes H4 appealing now is you can probably get it 2nd hand at around $200+++ if anyone's selling, cos $200 for audio interface, 2 inputs OR 2 mics is a pretty way to look at it.
citymusic is selling at $400+ if your budget can stretch another piece of blue yusof ishak photo more.
OR like I just mentioned, 2nd hand H4
it will be ideal for your purpose as you'll be recording vocals with the onboard mics. acoustic guitar/bass etc either with onboard mic or bass.
check out "My Love (Acoustic)" on
The Sallys 's myspace which I recorded purely with the old zoom H4 (vocals/acoustic guitars - onboard mics, bass direct input) but it's mixed so don't be mislead that it's just going to sound like that direct plugged.
when you decide to invest in a better/cost efficient vocal mic, I highly suggest Audio Technica AT2020 (XLR version) at around $160 cos I'm ab-using it for every/anything.
hope this helps!