So I've posted a thread sometime ago regarding a decent hybrid bike within 500 euro range. I got pretty sceptical after hearing your opinions that I won't be able to find one but I found this crazy deal on craiglist and bought myself Cube Editor 2014 for exactly 500e. The bike is pretty much in mint condition, except a few very tiny scratches.

Images of the bike

Since I got it for so cheap I'm thinking of upgrading it a little bit. However, I'm not sure if that's necessary so I need your help.

The things I'd like to upgrade:

1. Flat pedals. Current pedals are the standard Cube pedals (I believe so?) and they are the worst looking part of this bike. I'm thinking of putting Fyxation Mesa 61 Alloy Platform Pedals. They match the look of Editor and seem to be pretty durable.

2. I'm not a huge fan of full mudguards, especially when they are made from plastic like mine. Plus it doesn't rain as much where I live so I found this Ass Saver which looks relatively small and practical for what it's worth. Your thoughts on mudguards?

3. I'm also not sure about the SDG Rock City saddle which doesn't look too comfortable. I've been looking at many various saddles, however my knowledge is very limited in this area and I would need your advice on what kind of saddles would fit such bike. I know it has a lot to do with personal preference but overall I'm looking for something that would work while staying pretty low on the bike.

4. I know bike computer is not a must but I'm willing to try it anyways if any of you offer one. Garming Edge 520 looks really nice but I is a little bit out of my price range. Anything withing $100 range is appreciated.

5. Last but not least is of course a lock. I had terrible locks in the past and now I guess is the right time to get a decent one. My current favourite is Kryptonite Messenger Mini. It's pretty secure, long and light in weight so all in all seems like a golden middle. I'm not sure if I should invest in a more expensive and heavier lock.

Any suggestions are welcome.