Hi, I have a Saeco and I like it. With the standard pressurised portafilter you can get good (even very good shots perhaps) with lavazza il perfetto espresso, which is a very fine grind especially made for home espresso users (blue package).
I cant comment on the gaggia except that it has a bigger group head (58mm) vs the 53mm on the saeco. Makes no difference to me but a technical person might disgree... the thing that put me off was that it has an aluminium boiler, which may corrode over time, whereas the VV has stainless steel!
People will tell you that the Silvia is the best, and other people (sometimes the same people) will tell you that it has a bigger learning curve. One day I would like to have a silvia, but first I will be buying a good grinder, which after 5 seconds of reading this forum you will be convinced is far more important than the machine itself.
I would even consider getting a sunbeam cafe ristretto (yes the cheap $90 ones!) and a good grinder.... I have that little guy for about 5 years and it is very reliable and simple, and it has a boiler in it which none of the other sunbeams do! Apparently the cheapest acceptable grinder is the sunbeam EM0450/0480.
Keep in mind I am only learning too, but this is the info I have gleaned from the forums. Your opinions may differ wildly from mine, which is one of the beautiful things about humanity.