Depends what you call top end really.
I mean...a Shocker, is a Shocker for example...they all need stuff doing to them...but a stock one, is cheaper, than a Private label one.
Timmys are jumped up Spyders with funky milling..sorry, my opinion...oh and they bounce like my mrs on a good day..
Cockers are stonking gats...Nexus Cockers are really nice looking Stonking gats...but...they are a tech heads gun..
If you fiddle with them, without knowing what you are doing...you can casue yourself grief...if you dont, they are very reliable, lend themselves to accuracy, fast as you like, and very efficient...also, teh most upgradeable gat you can buy...noting you cant change.
DM4/5/C and soon the DM6 *COUGH*...are excellant, well made guns..and DYE have very good tech support...bit gas hungry, but that can be remedied...
Cant tell you too much about Ego's, other than they work on a similar principle to Timmys, but are obviously, much better, because, I dont like Timmys...and they were made by Planet, which is another Bonus...they are very popular, and a few custom versions are starting to appear...'
Angels...never liked the original Angels...but teh newer Speed 05, G7 etc seem to be very god, very pretty gins...not sure if they still group like a shotgun at High rates of fire, but hey...that can be addressed...
For christs sake, dont buy a new gun...waste of money...especially, if its an Angel...