Hi.  This is my first post.  I've been considering Geothermal for my home on Long Island, NY for 3 years now.  I have received quotes of 45 to 55K for a 4 ton system from a very limited number of contractors (limited because it seems very difficult to find a geo thermal contractor in this region for some reason). 

I MUST replace my oil heating system as a matter of principle.  I am considering natural gas for about 8K but would much perfer geothermal since we all know it's the way to go, and besides, its just so cool! 

Anyway, I can't afford 45-55K.  I have seen a number of outfits on the internet that advertise systems for do-it-yourselfers for 20k or less.  I am a handy guy and have access to excavation equipment, etc..  However from what I have read in these forums, it is more complicated than just drilling holes running pipe and plugging it in.  For something that looks too good to be true, can anyone tell me what to look out for with these on-line outfits?  Also does anyone have a story, good or bad, about someone who got involved in a DIY geothermal project?