K series superlight or 1.6 Sigma roadsport

[Yoyoman]

Hi all, I'm looking to purchase my first Caterham and want to spend around 20-25K. I've been down to my local dealer and seen a k series superlight for under 20k, it does seem though to have had a lot of work done to it (spec below) :

1.6 Caterham Superlight No.128
Rebuilt and uprated engine (2007) Producing In The Region Of 200bhp
Performance Cylinder Head
Emerald K3 ECU
Jenvey Throttle Bodies
Uprated Heavy Duty Clutch
Lightened Flywheel
Limited Slip Differential
De Dion Rear Axle
6 Speed Manual Transmission
Porsche Riviera Blue Paint
Lowered Drivers Floor
Carbon Fibre Front Wings
R500 6″ Front & 8″ Rear Wheels
Wide Track Suspension
Adjustable Platform Dampers
Track Day Roll Bar

After having heard numerous people complain about the k series reliability issues, how reliable is the above car going to be? Is 200 BHP even possible or are they over estimating ?

My other option would be to buy a 1.6 Sigma roadsport and then get a few upgrades done when I have some more free cash.

I'm mainly looking to use the car on the road with a few track days thrown in and want something reliable.

Any advice would be appreciated.

Thanks

[Yoyoman]

Thank you all for your feedback.
I think I will probably go with a sigma engine.
Whilst a k series is tempting, I haven’t got the knowledge to change head gaskets and don’t want the worry of one going on me. Or maybe I should hang on a few months to increase my budget and get into a Duratec 🤤