https://www.kitguru.net/components/cases/james-dawson/silentiumpc-launch-a-trio-of-cost-effective-pc-cases/
 
The European manufacturer of CPU coolers and PC cases, SilentiumPC, presents the successor of its popular Armis AR5 case series. The new Armis AR6 lineup is aimed at gamers looking for a PC case with maximum versatility and stylish design combined with outstanding value for money. SilentiumPC has developed three different versions of the case for this purpose, which are identical in terms of their internal construction, but differ in their exterior and (A)RGB lighting. All models are designed for excellent internal ventilation and implement the new Natissis internal structure with dual-chamber layout. The Armis AR6X TG RGB and Armis AR6X EVO TG ARGB are supplied directly with total of five 120 mm fans, the Armis AR6Q EVO TG ARGB with two 120 mm fans.

The Natissis internal structure, recently introduced in the Regnum RG6V case series, has been incorporated in the new Armis AR6 series. It utilizes the dual-chamber design which has been perfected by SilentiumPC, providing outstanding flexibility when it comes to the choice of components for high performance systems and offering outstanding cable management.
 
All three models are delivered with a tempered glass side panel in order to properly display the installed components. The mandatory I/O panel is located at the top of the front panel. Besides the power and reset button, it is equipped with two USB 3.2 Gen 1 ports and a 3,5 mm jack for a microphone and headphones.

The SilentiumPC Armis AR6 models are available as of today.

The Armis AR6X EVO TG ARGB and Armis Armis AR6X TG RGB are priced at 83€, while the Armis AR6Q EVO TG ARGB goes for 65€.
 
So even low budget PC modders in my opinion can find good bargains on below 100 Euro PC cases. 
 

looks like you have plenty of to work with big plus.....

Front side vents are silly when it comes to high powered gear.  Great for low to mid tier stuff.