My favourite piece that I've written at the moment is Power v4.

My recommendations of 2 pieces I've heard on iCompositions and would advise you to listen to are:
In the Doldrums by Soulima and "War Game Suite" Op. 17 by zeroAcademy.

I also have some external recommendations of pieces not on this site:
Tchaikovsky piece excerpts, particularly his Violin Concerto, Prokofiev - Lieutenant Kijé (Romance), Rimsky-Korsakov's Scheherazade, and of course Holst - The Planets - Jupiter.

Title	Genre	Released	Plays
Charlie and the Chocolate Factory Opening Titles	Classical	Jun 28, 2011	543
Danza	Classical	Apr 11, 2010	469
Growth v2	Classical	Feb 21, 2009	449
Lush (Woodwind) v2	Classical	Feb 28, 2009	620
Marimba Duo	Classical	Aug 19, 2011	399
My Hypothetical Musical - Ladies and Gentlemen	Classical	May 9, 2009	560
Ode to Jump	Classical	Apr 10, 2011	212
Power v4	Classical	Jun 14, 2009	727
Slugeop	Other	Aug 18, 2011	266
Soundscape - Tension	Classical	Jun 27, 2011	150
String Quartet No. 1	Classical	May 15, 2009	1137
Theme from Tetris	Classical	Apr 8, 2011	244

Title	Artist	Genre	Plays
A Nightingale Sang in Berkley Square	dirigent	A Cappella	1938
A Rose	rochestas	Classical	667
Adagietto for String Orchestra	soulima	Classical	1035
Among The Trees	kassia	New Age	967
Aria	dirigent	A Cappella	2300
Birds of Sorrow	soulima	Classical	857
Dance of the Dunderheads	soulima	Classical	924
Dance of the Prairie Wind	kassia	Classical	855
Der Wassermann	dirigent	Classical	3409
Doubts	kassia	New Age	839
Eons - Duncan Crevice Caves	soulima	Classical	910
Epic Adventure	Duke	Classical	815
Golden (Tomorrow Will Shine)	kassia	Classical	804
Grotesqueries for Orchestra - Fifth Movement	soulima	Classical	709
He's A Good Chap	dirigent	A Cappella	3225
Il est bel et bon	dirigent	A Cappella	4290
In the Doldrums	soulima	Classical	879
Journey	kassia	Classical	840
Lazy Afternoon	soulima	Classical	758
LULLABY FOR LUKE	SISTERS [+1]	Ambient	289
Maria durch ein Dornwald ging	dirigent	A Cappella	5259
Men (Remastered)	dirigent	A Cappella	1574
Monologue	soulima	Classical	765
Nunc Dimittis	JoelGoffin	Classical	914
Op. 17-Scherzo in G Minor for Piano-"The Christmas Scherzo"	cjdarnieder	Classical	450
Pachelbel's Canon (Canon in D Major)	soulima	Classical	8123
Perpetuum Mobile V	soulima	Classical	1149
Soliloquy	soulima	Classical	743
Soul Bossa Nova (Theme from 'Austin Powers')	soulima	Classical	17238
The Kingdom	j_livingston	Classical	483
Theme from 'Schindler's List'	soulima	Classical	3477
Theme from 'The Simpsons'	soulima	Classical	5172
Thunderstorm	rochestas	Classical	485
Try To Remember	dirigent	A Cappella	1436
Two lovers	davidmottram2009	Other	403
Vita Luna	JoelGoffin	Classical	583
Was macht der Herr da bei Fräulein Gerda	dirigent	A Cappella	657
Zoomorphisms - Elephant Graveyard (For Geo)	soulima	Classical	1171
Zoomorphisms - Fawns	soulima	Classical	598
Zoomorphisms - Lounge Lizard	soulima	Classical	787
Zoomorphisms - The Caterpillar	soulima	Classical	671
Zoomorphisms - The Dragonfly	soulima	Classical	1213
"War Game Suite" Op. 17	zeroAcademy	Classical	2168