I am not that sure of the exchange rates at the moment, but here are some suggestions (from the major manufacturers) for your requirements...
Scubapro Twin Speed Fins - Full Foot
A unique concept using three modern materials. Adapted from the Adjustable Twin Speed revolutionary concept that exceeds todays traditional fins performance by 30%, while reducing diver effort. Contains a full foot design for comfort in warm or temperate water; no need for booties.
Mares Avanti Excel
Following several tests on new materials, Mares Lab has created the Avanti Excel, to improve again the performance over the already legendary Plana tradition. Elastic OPB, Superchannel Thrust, Tri-material technologies and the Whale Tail design all fused into an unique extraordinary fi n, ideal for demanding divers. Available in 34/35 size from March 2008.
MARES Avanti Superchannel Full Foot
Due to the compact length of the blade the 42/43 size in 37cm (14.5in) is the ideal fin for travel and for dives in warm waters. The orthopedic foot pocket with variable thicknesses provides superior comfort. The blade is constructed of Tecralene® and Thermoplastic rubber for extended durability.
Splitfins are a novel design concept meant to maximise power, whilst reducing effort. Some people love them, whilst other criticise them for certain drawbacks (mostly relevant to technical divers).
The fact is that a fin can only provide you with forward momentum...regardless of whether the water is still or moving. If the speed of an opposing current exceeds your speed, then you will not move forwards.