Tier 2 from umbrella company OR from my current employer?

[muskan]

A dilemma :
 
My situation:
 
1.       Currently on PSW expiring in Feb-12.
2.       Working in IT in very good company on permanent position since 10 months.
3.       Earning £25,000 per year. ( which really less for me and getting calls for contract work with very good day rate)
 
I have two option:
Option 1: My company is ready to sponsor me with unrestricted COS. (Same salary and same work L I really want to earn more and work more)
 
Option 2: I have spoken to one Umbrella company who is ready to sponsor me as well but they will charge 23.5% of my salary earned. (But this could be still more than what I am earning right now). Is sponsorship from Umbrella company is Legal? Will it be any problem in future? Is this charges too high?
 
Please I will be really grateful for your suggestions and opinions on my situations.  Which option should I go with?

[geriatrix]

Please don't make multiple posts on the same topic.