I got a little carried away on that one and ended up with the Elite Direto
So you've got the Direto? Good choice if so, a sound & solid investment which you'll not need to replace for many years. New Tacx Flux owner here which I got for around £50 cheaper than you got your Direto, but also coming from 2 older & cheaper trainers over several years of use. If I'd have spotted that Direto deal, I'd have got one!
I'd go with the Pinnacle, it's within your (now lower) budget, is a sound investment as a well regarded and solid setup for the money. Has mounts and guards for possible future use as a commuter, which also increase it's future resell value and/or use as a winter hack.
Don't forget your primary aim is to get a bike you can easily put on the trainer to get riding, with the
possibility of future outside riding. Cheapness and ease of use should be your main purchase considerations. Going for simple rim brakes as lets face it you don't need them on the turbo, meaning investment in discs are a waste if you never ride it away from the trainer. Same could be said for investment in a racier frame, or carbon, or nicer wheels, or wide tyre support. It's all superfluous if you get the bike and only use it on the trainer (which lets face it, is your primary aim).
Save your money for future investment, or other kit (shorts!). There's little point investing it now with a 'what if' mindset as when (if) you get to the stage of wanting to ride outside as your primary over the trainer, you'll be several months down the line, several kg's lighter with much more interest in riding. You'll relish buying an 'outside' race/faster bike and probably be far more willing to invest more money in it as you'll be enjoying cycling!