and how much should i pay to have these mods done

You might as well do them separately, since they are located in different parts of the engine bay it doesn't matter.

edit:
I just saw where you said "how much should I pay...". Were you planning on paying a mechanic to put those items in? The motor mounts are pretty simple to do. The udp is easy as well, but it just takes patience. Here are links for directions on installing the front & rear motor mounts.. and UDP installation

Front Motor Mount Installation (by VEGASDSMR):
http://seangordon1.tripod.com/mminstall.html
Rear Motor Mount Installation (by ME):
http://www.ourformerselves.com/richard/rearmotormount.htm

Underdrive Pully Installation (by VEGASDSMR):
http://seangordon1.tripod.com/UDPinstall.html


Thanks, Richard (97 ESi)
http://www.ourformerselves.com/richard/main.htm


BEST TRACK TIME -- 16.46 @ 86.03mph
----------------------------------------------------------
COMING MODS:
NER 1F Turbo Kit w/ Turbonetics T3/T4 S-Trim Ball Bearing Turbo || Autometer Phantom Boost, Air/Fuel Ratio, & EGT Guages || Autometer Full Pillar || HKS Type-1 Turbo Timer

CURRENT MODS:
AEM Cold Air Intake || Magnacor 8.5 Ignition Wires || NKG BKR6EVX-11 Spark Plugs || Front & Rear Strut Bars || Eibach Springs Pro-Kit || KYB AGX Adjustable Shocks/Struts || AF/X Underdrive Pulley || Pacesetter - Monza Exhaust System || OBX Racing Sports - B5 Bomb Tunable Muffler || Energy Suspension - Motor Mount Inserts || Bored Throttle Body

POINTLESS MODS:
Sylvania Cool Blue Headlights || Cobra Eyes Windshield Washer Blue LED Lights || Nokya Motorsports Sport Pedal Set

Thanks, Richard -- 97 ESi
16.46 @ 86.03mph

http://www.ourformerselves.com/
http://www.cardomain.com/id/talonipse/

AEM COLD AIR INTAKE | PACESETTER 2.5" MONZA CAT-BACK EXHAUST SYSTEM | OBX B5 MUFFLER | ENERGY SUSPENSION FRONT & REAR MOTOR MOUNTS | 18X7" ENKEI RSF2 WHEELS W/ NITTO NT 450 215/40Z TIRES | GOLDLINE LOWERING SPRINGS | KYB AGX STRUTS | INGALLS FRONT & REAR CAMBER ADJUSTERS | ALPINE CDA-9807 RECIEVER | ALPINE MRD-M300 AMP | ALPINE SWR-1041D 10" TYPE R SUB | Q-LOGIC QLH-.6510SX ENCLOSURE | STINGER HPM 8GA AMP KIT | DAYTONA BLUE PAINT JOB | IMPULL R34 FRONT BUMPER | BLITZ REAR BUMPER | BLITZ SIDE SKIRTS | ECLIPSE TURBO WING | PROJECTOR HEADLIGHTS (BLACK/BLUE) | EURO ALTEZZA TAILLIGHTS | STREET GLOW SG-201 NEO-BLUE NEON UNDER CAR KIT | SPAL AMENITY SHAVED DOOR KIT | REVERSE NITE GLOW GUAGES | OBX SHORT THROW SHIFTER | SYMBORSKIT SHIFTER KIT | AFTERMARKET BLUE SHIFTER | NOKYA FOOT PEDALS