Php dating site scripts

I know this subject has been discussed a lot but I’m still confused. I don’t have the budget to hire a dev team to build a custom solution so I’m looking at commercial scripts. It seems like all the commercial script companies spend a lot of time trashing each other so getting reliable info seems hard.

I want to build a niche dating site following the pof model with a really simple ui that is not loaded with distracting resource sucking features. I just want the basics, photos, messaging and decent search. I know how to hack templates, CSS, php, etc. The three things I need are: easy to mod, stability and most important the ability to support the most concurent users on given hardware.

Which product can support rhe most concurrent users?

Any unbiased feedback would be greatly appreciated.