Hi,

IIRC the 1N400x series all can handle about 1A forward current - not a problem since the relays draw well below that, likewise for the amp turn on input.
The difference between the various 'x' models of the 1N400x series is, again IIRC, the max reverse voltage they can handle. I'm suprised at your number of 1.7V for voltage drop over a 1N400x -- IIRC they're more like 0.7V (starts to conduct) and about 1V when running ~1A through then...

Another diode point, you may want to put a diode in the reverse direction across any relay coils (if teh relay doesn't already have such a diode internally). When the relay turns off, the coil can generate a fairly large kickback voltage, possibly large enough to harm any delicate output that is controlling the relay (ie your phone kit). Wire the striped end of the diode to pin 85 (if you connect the positive side there) and the other end to pin 86. This limits the induced kickback voltage to about 0.7-1 volt.

/Michael