F1 over Gk 700/1001rb series

[test dude]

Im stuck now. I have my b2re head and now a 6x10. The b2re isnt cutting it because I cannot hear my self with it and my 4x10 in practice. (nit sure how the 610 is going to sound now at practice) but im looking for a new head and to keep the b2re as a solid back up for gigs. Ive played a gk800 rb and loved the tone. I havent heard of markbass products until mostly searching the forums and what not. Can gk compare to the f1. I need the punchy deep tone for my rock punk funk band. Please let me know. I need to make a decision soon. (I dont have the time or resources to actually try this equiptment) Thanks guys I appreciate any help.

Also my budget of 400 - possibly 500, puts a limit on my purchase, but already a few tber's have gave me some suggestions and I thank them. im doing research on every hit I get aha. Whether it be youtube, reviews, tb.com. I like to know whats going to give me good use and doesnt have a history of problems.