Intermix Engine Issue???

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Hi,

I bought a used Porsche Boxster S 2000 with 158 000Km (around 100k miles). I replaced RMS, IMS, oil change and spark plug. I did only 100km (60 miles) with the car and I noticed the coolant light flashes, I pull over and I top off coolant. I did only 10 miles again and the coolant drop again but the light did not come on. I looked at my coolant and I have oil inside. I read a lot of all the forums and in my Pelican books before bringing the car to a mechanic. He put the car on the computer and did a few test below

Porsche Boxster S 2000
Km= 158 592
HR=2992  58.4km/h OK
Check coolant leak + Oil in Coolant tank
Check Computer
Cut ignition one by one = OK
Misfire = OK
Pressure tank test = OK
Compression test1=140.2, 2=145, 3=145.4, 4=145.5, 5=145, 6=145
Remove oil filter and check for particles= Aluminium (few) particles in oil + Coolant in oil

I called a few Porsche Specialist and everybody is telling me a different story. I compiled the data and most of them are telling me to look first at

1) Oil cooler
2) Head gasket
3) Head cracked
4) Cylinder liner cracked or slipped
5) Block cracked

I do not want to open it for nothing if the engine is totaled. I prefer to swap the engine...

a) Can I have a cylinder liner or block cracked with the compression test above and without any misfire?

b) Some people told me that it's normal to have a few (4-5) aluminium particles in the oil filter but should not be like a scoop...?

Any thoughts...

Thanks in advance for your help...