I've been thinking about a 914-6 conversion too. I know I have a nice car already, but the 6 cyl just keeps calling me

I would say it'd cost about $15k to do the whole thing w/ good pieces. I am planning on going for a 3.0 engine. Has anyone worked w/ Motor Meister...their kit looks really good. I'll probably do the brakes and 5-bolt conversion first...this will also split up the costs!
Who knows I might have some 2.0 4-bolt Fuchs wheels for sale some time

Brad is right, the total costs all depend on what you want, from a 2.0 -> 3.6L engine, heat or not, nice external oil cooler, upgraded chassis + tranny etc. Just set your sites, get some money saved up and go for what you want!
Nathan
PS: Jake makes some really nice big type 4's so that is also an option w/o going for the 6.
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'73 2.0 914