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(1) Your landing address.
Your landing address is confusing. I do understand that this is because of the mod creating pages inside the forum but still, do we have to see it?
I'm not particularly knowledgeable in this area but I think there must be ways around that.
A) Force the url to be displayed as "mvpxc.com/". I think it requires manual edit of the settings page of your forums through the cpanel, something you shouldn't tamper with unless you know what you're doing.
B) Create a subdomain in your panel that points to ..*MVPXCFILES*/index.php/Pages/ so when your users land to your place it becomes
subdomain.mvpxc.com/index.html and point the main url towards it.
(2) Title won't say what site I am visiting, not big deal, you just want to have the pages plugin to add to the title the "MvPxC - " prefix so when people change tabs or is a long title, they will have this reference along with the favicon.
(3) Searchbox.
Me nitpicking, I'll try to be brief. I like the search bar design a good amount, it is very professional looking. The first part is a dropbox that allows me to filter by areas (3A), which is great. The advanced search button (3B) sends the person to a new page with retaining what was typed previously. It'd be great if you can make it retain the searchbox content, otherwise I suggest the black of the "go" part to be turned in a blue hue. This way the text-box, filter and magnifier glass are all visually related with the blue tones while the clog icon will jump out and thus convey better the idea of something unrelated to the search at hand. I don't know if how that might intrude the aesthetics of your header and search-bar altogether which already looks nice but might be worth a shot.