From experience I would advise that if you want to do it right then do it right from the start. Do not compromise as it will probabnle cost more in the long run.
I used to have 2 Juwel tanks and I think they are great tanks but I feel they have their limitations. This is not to say you cannot produce a stunning tank or scape with them as you only have to look at what Alastair and LondonDragon have done to see it can be done. For me personally I had a few bug bears.
1. The internal filter - Its a great filter but is an eyesore. It can be removed but this can be fiddly and you may end up scratching the glass or be left with unsightly silicone marks that seem impossible to remove.
2. Lighting - The T5s are very powerful and this means that you have to be on top of the game to prevent algae outbreaks. What is frustrating is that there is no way to control the intensity as the lights cannot be dimmed or raised. Therefore you are left with just control of the lighting duration.
3. Trim and Bracing - The tank looks nice but not as nice as a rimless/braceless tank. The trim can be removed but will leave a mess and IMO the tank does not look great open topped with that trim. The bracing also gets in the way of any maintenance tasks and fish catching.
4. Minor things - with a plain than you can simply spin it around if you end up scrathcing it enough to become unsightly. You cannot do this with the Juwel as the back trim is cut out for the cables etc to be fitted.
Ultimately its up to you but I went from Juwel tanks to rimless/braceless and I am much happier with them.