Should I sell my tele vue NP-101 and buy a genesis (as I mostly do narrow band imaging) ?

[rorymultistorey]

Hi clever people (and fellow geeks),

I live in London and I mostly do narrowband imaging from my roof. I have a 2005 tele vue NP-101. Its  an F5.4  super apo. Its a great scope and it cost (with a few other bits) around £1800. 

Question: Would I be wise to sell it and instead buy a tele vue genesis? The Genesis isn't a super apo but I'm thinking that doesn't really matter for narrowband imaging and at f5 it is a bit faster which will help. As it is a petzval design I'm assuming it will have a nice flat field. I can get one for around £600... and I could use the money I've saved to buy pixinsight and other bits of astro kit. 

wotdoyathink?