Lowest Cost GPS IFR system?

I put a used GX50 IFR certified in my 172 for the following cost:

Used GX50 with antenna at OSH 2 years back $1800
New Mid-Continent CDI with annuciators: $795
New Sandia Mode C encoder with serializer $350
Installation labor, sign-off, flight test $1350
Factory repair of used GX50 $450

Total: $4745 (plus misc shipping charges)


"tom pettit peak org" tompetatdot wrote in message
...
I'm currently flying VFR in a vfr equipped plane. What would be the
lowest cost GPS based instrument system I could install and be legal for
IFR flying?

I looked through the last six months of this newsgroup, but didn't see a
FAQ or the answer to the above, so I hope it won't be something that was
just hashed out.

thanks,
tom pettit