30.9 External (inline) Dropper Post recomendations

I always thought I wouldn't need a dropper on my XC bike but after getting smashed in the nuts more times than I care to remember at the weekend I'm going to take the plunge. My absolute max budget is £150 and looking for recommendations. I'm not that fussed on a Reverb, although there are plenty around second hand within budget as I'd rather have the simplicity of a cable dropper. Would I get a second hand Thomson within budget? And if I could would it be worth it over buying say a BrandX one from CRC new? Any other brands to consider?
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NukeProof Mega FR 2012
Cube NuRoad 2018
Previous:
2015 Genesis CdF 10, 2014 Cube Hyde Race, 2012 NS Traffic, 2007 Specialized SX Trail, 2005 Specialized Demo 8
Would be just as annoying if a cable snapped in the middle of nowhere too though.
Also, wouldn't a cable actuated post stay at full extension but remain bouncy if the cable snapped? I'm not entirely sure how the cable ones work to be honest
NukeProof Mega FR 2012
Cube NuRoad 2018
Previous:
2015 Genesis CdF 10, 2014 Cube Hyde Race, 2012 NS Traffic, 2007 Specialized SX Trail, 2005 Specialized Demo 8
Cables controlled ones stay up and don't bounce.
NukeProof Mega FR 2012
Cube NuRoad 2018
Previous:
2015 Genesis CdF 10, 2014 Cube Hyde Race, 2012 NS Traffic, 2007 Specialized SX Trail, 2005 Specialized Demo 8
Two levels of drop 40mm and 125mm.
Have a read up and do a bit of research, its worth it.
09 Canyon Ultimate CF for the Road.
2011 Carbon Spesh Stumpy FSR.
Bird Aeris 120 | Boardman Team 650b | Boardman Pro FS | Calibre Two.two