Convertibles are great - if you are the outdoors type. Obviously many buy them thinking that they want one and then don't - evidenced by the number of roofs that are up on dry and hot days. As with all things there are ups and downs, some of the downs being:
- chassis not as stiff as equivalent roofed car. Not really an issue at legal speeds
- sitting in traffic is not so pleasant as exhaust fumes are direct to nasal passages
- roof not as secure when parked
- wind ruffled hair never feels clean (as I recall, not an issue for me these days!)
- music is compromised by wind noise
- constant niggling doubts that the weather will turn
- can be difficult to sell
The two that you have picked don't look too bad but neither are particularly stand out in today's traffic. To my eye the Saab looks like a moccasin slipper with the roof down, the Audi is prettier. For something a little more head turning and within your budget there's the E30, an example being:
https://www.ebay.co.uk/itm/Bmw-E30-Convertible/302870568514?hash=item46847e1e42:g:bpUAAOSwh6VbjvD3I used to play with E30s and there's a devoted cult following. Hard tops are available occasionally too making it an all year round car. E36 convertibles are cheaper still but not quite old enough to be past their 'council' tag yet if image bothers you.